1\\lS -- 1tt\\l\(\UtS

and l)\\l\ft\lli l\\\lS

ALVIN X-ACT 5 " POCKET SLIDE RULE

Machine divided prec1s10·1 graduations deeply engraved with black and red scales. Fabricated of pure white Oivinyl Plastic dimensionally stable and resistant to acids, oi ls , etc. Complete 5" ru le with scales K , A ,8, C i , C, D, S & T. Smooth riding Cursor, specia l ly designed chrome finish frame wil l not s l ip off rule. Furnished with leather sheath with simpl ified instructions.

NO. 222P . . . . . . . . . . . . . . . . . . . . . . $4.95 EA.

10" ALL-PLASTIC STUDENT MANNHEIM

NO. SR400

NO. SR400 1.4" thick. pla11ic bracket,. plain back. $ 1 .95 ea.

10" ALL·PLASTIC STUDENT BASIC TRIG

ADJUSTABLE "A" SCALE

Ill--- --'-: 1�:�·l; · ;·;' '1-'1

l.;· ;�·;l .

I U.1 , , , . l.. . tl f, . , . l , .I· . � ....

IJ<--- - --''!c..'/'� ;�·,; !\;' ·,·� :' �, 0 L r-•,.....� , ...-�•r�

-SR-600-NO. SR600 AdJu•table acalea divided Into degrees and minule1. 20" S "scale. AdJu1tabJe· cuu�r. Ideal tor all arlthmellc. ffiechanir:al and navigational problem,. $4.95 ea.

10" ALL-METAL PROFESSIONAL LOG LOG

NO. SRl 3 1 1 Magnesium alloy core with white nllrale facing•. Adjustable 2-color 1calea. Double cursor. C-D acalea on both aidea. Sc�des: L-LLI-DF-CF-CI F-CI-C-D-LL3 and LL2 on one side in register

with LLO <!ind LLOO-A-8-K-CI-C-D-S,ST and T on reverse side. Complete with leatherene sheath $13.95 .ea.

"Cj)UIC·KLEEN" DRAFTI NG

CLEAN I N G POWDER

ALVIN

STEEL PENC I L

POINTER

Select Drawing Scoles and Slide Rules 10l[W00D WIDTE EDGE - ENGINE DIVIDED

Our finest profenional grade triangular Boxwood 1cale,

.(

of 1uperior workman1hip and appearance, facea completely embodied in while pla11ic for durability, engine divided for abarpneu of gradua\ion1, diviaiona ol precise accuracy with colored furrow, for quick choice of dHired 1cale, , improved dHign.

ABCHITECTS' OPEN DMDED No. z•1-12 in. Divided: 3/32, 3/16, 1/, . 1/, . 1/t , I. ¥., >/, ,

1 1/1, 3" lo the fool. one edge divided to l6th1.

l,1,1i11l ,1,1,1,l,1i1 ,1 rt1i1,1il,11i111li1,11111lt1,1iltl!L1ilwlilt!

ENGINEEIIS' CHAIN SCALES - FULLY DIVIDED No. 241-12 in. Divided: 10, 20, 30, 40, 50, 60 parls to

the inch.

BOXWOOD WHITE EDGE - ENGINE DMDED

A very popular scale tor lhe Professional with oppos1le beveled edges SupplLed in polished ftntshed Boxwond with while gloshc edges Engine 01v1dcd graduations that are sharply engraved These scales are of a superior qualily i n hmsh and desion

No. ZSS-12 i n. Divided (double numbered) full size, t 1 2·· ·.:. I It l inches lo ! 61hs. ( l f.ths acluall Holl size ( 6"' - � l lt.l inches to 1 6ths (32nda octuall .

MECHANICAL DRAFTSMEN"S - FULL T DIVIDED •110. 258-1 2 in. D1v1ded . full size, inches reading to 32nd1.

Full size, inches reading to 50th1.

BOXWOOD WHITE EDGE - ENGINE DIVIDED flat. lour bevel Boxwood scale beautdutly hnished wit�

embodied plashc edges A high grade prolessional and lechn1cal scale of unsurpassed workmanship Engine divided graduations clearly engraved lor eai;y lcg1bd1t y, durable construchon for lasting r;ervice

ARCHITECTS. - OPEN DIVIDED No. 250-12 in Divided 1,, . 1/t . 1/i. I, 'I, . 1,, , ] If: . and 3"

to the loot ENGINEERS' CHAIN SCALES -·ruLLY DIVIDED

No. 261-12 in Divided 1 0, 30 . 40 and 50 parls lo the inch.

BOXWOOD WHITE EDGE - ENGINE DIVIDED rour bevel Pocket Scale, w:1 h plastic laces embodied ever sea

soned Boxwood The ideal pocket scale. 1nciispens1ble ic proless1onal

�nd technical men in the held or on th� Job Engine d1v1ded gradua-11<:>ns are precise and clearly engra�·eci for lasting wear. in strongly sl 1 lched genuine lealher sheath, conveniently earned 1 n onc"s pocket Truly a versatile & m. scale supplied in various graduations to cover moat phas,is ol measurement.

ARCHITECTS" - OPEN DIVIDED No. 266-6 in. Divided: 1/e , I/• , 1'2 , 1, %, l/4 , l 'h , and 3"

lo the loot. ENGINEERS" CHAIN SCALES - FULLY DIVIDED

No. 267-6 in. Divided: 10 , 30, 40 and 50 parts to the inch. (double numbered)

Nos. 240 - 24 1

$4 .75 ea.

A good quality gr::!�:�g��r 1cale for bolh Colle-.c giate and Vocational use. Made of choice bo:rwood neatly poli1hed to a natural finish and graduated clearly for preci1e mea1uremenl. Heavier atyled conalruclion regular deaign.

ABCHITECTS' -

OPtN DIVIDED No. ZIZ-12 in. Divided, 3/32. 3/16, >/, , 'I,, it,. I, \\, ¥,,

l l/1 , 3" lo the loot, one edge divided lo 16tba.

ENGINEEB.S' CHAIN SCALES - FULLY DIVIDED No. 213-12 in. Divided : 10, 20, 30, 40, 50, 60 parts lo

the inch.

No. 2300

NO. 306

MECHANICAL DIIAFTSNEN'S - OPEN and FULL DIVIDED No. 212X· 12 in. Divided: ¥. , l/4 , 1/,, 1/• , 1/J, I, SO. half and

lull ..... $ 1 .:2s ea.

ERASING �HIELDS

Packed 1 Doz. to a Box

Individually enveloped.

$.20 ea.

- � � ­· - ·- - - . . �- •,..--... - - -

NO. 3296 FLEXIBLE STAINLESS STEEL ERASING SHIELD. Made of the finut material .005" thick, highly polished, with 16 aperture1 of voriou, si.J,I", to allow oc.curate erarnrei. Si1e 2 1/i" x l l/,1 ". For cleaner drawings, sharper lines,

and better prints. Ideal for preventing and removing soil on drawings. Ory cleans tracings and art work. Keeps drawings clean without lessening their sharpness. Recommended for cleanser of old dirty drawings . . . .

Th, "Ev•lut" Multi-File. S in. lonq. ldul $.35 ea.

314'' x 1 0 yds. 'Ii" x bO yds. %" x bO yds.

$. 35 EA. $ 1 .00 EA. $ 1 .20 EA.

$ 1 .55 EA.

SEMI-CIRCULAR AND CIRCULAR PROTRACTORS

NO. 1 246 $. so

Canister witb shaker top (2" x 211, " )

N O . 1 247 $3.00 I lb. container with metal pour spout

"SUl'ER" l-WAY ,ocKET PENCIL SH.U '(NER �fay Be Co1r,ied In Your Pod•f, Pu11e, Or 8r,.fcue

• COMPACT

• CLEAN

• RELIABLE

1et In plastic • Packed In oltractive lhree-calor

carlon1

NO. 6132 $1.00 ea.

pencil le,d poinhr, eruer clean,,. tad lifter or h,ndy lethr open••· Pr.cliul end inde1huclible. Economic,lly priced.

DUSTING BRUSHES

NO. 1 248 $.65 EA.

I " x bO yds.

TRANSPARENT

I R R E G U LAR C U RVES

Professional quality, .060 thick, hand finished acrylic. Individu­ally wrapped.

Extra heovy .090 tronsporent plostic protractors with cut­out cenler .and bev­eled outer edge. Accurate gradua­tions printed be­tween two lominat­ed sheets cannot

PROFESSIONAL GRADE rub off. NO. '76 SEMI-CIRCULAR PROTRACTOR 6"· SI .00 ea. NO. ]76 ••oTA•CTOR •.. $ .30 ea.

NO. L666

fOI ,n,rc, HNCll lfTIUING OjJ(tlOIIUINl,"lf\lYH T 11 SUlto'l la•••tft�IJ�,a" .,.,,,1 u�•• r o

Al)CIEGHJKLMNt,, ,STUVW11Vl23-4�7e•tl * Al3CIEGHJKLMNI� � ,STUVWX'fZ23"1�i7••91.

NO. 360Y DO·ALL LETTERING GUIDE Three sins, '/1", 3/1&", and 1/4" upper case letters and numbers with 1/1" lower case let­ters, all on one quide. Size's 1¥1" x 9l,4" x .020". $2.60 EA. NO. 3605 Same as above with slant letters.

$2.60 EA. NO. 260V Same as above without lower case

letters · . . . $2.20 EA. NO. 2605 Same as No. 260V, but with slant

letters . . , $2.20 EA, NO. 460V 31," Letters and Numerals. .

$1 .50 EA. NO. 560V 5h" Letters and Numerals

$1 .75 EA. NO. 1 60G GrHk Lettering . . . . . . $2.50 EA,

No. 50 Pocket Pal -.o3o thick s 1 .00

Useful circles, hexes, deltas and squares. Cul ouls scaled from 1 /16" up lo 1 •. 3-5/16" x 5'

No. 57. Screw Head Template

1 3 he•ogons, 1 3 circles, 13 cul outs ond 9 Jquore, 7 % " • 5"-.030 lhic\ $2.00

HOUSE

PLAN

TEMPLATE

No. 30T

$1 .50 EA.

Scale: 'I•" = l 'O" Size 51/4 " x 63/.,". Used for circles

_. rec�angles, spacing, roof pitch gage,

plum�mg fixtures, doors, kitche'n equipment, electric symbols, and stairs.

ALVIN . . • Handy Drawing Templates

TRU, CIRCLE TEMPLATE GUIDES Draws circles quickly, easily, accurately. No. 445 circle master template contains 44 circles grouped In progressive sizes with Increments In 64ths, 32nds, 16ths and 8ths, 4ths and 1/2". Circle diameter sizes from 1/16" tp 3". Four corners of template precision cut to give radii 5/B", .3/4", 7/B" and 1" diameters. Fine quality matte Cinlsh non-glare acrylic vinyl plastic . 030 thick. Rigid, durable and shatter proof. Overall size of template 7" x 9 1/4". Precision milled circles with ailowance for pencil clearance of 1/32". Each circle size clearly marked; all have center guide lines. Assures neat accurate circles. Template Is supplied in sturdy card folio.

NO. 445 - · $2. 50 ea. J

NO. 440 LETTERING-SLOT-GUIDE Made of .060" thick acrylic material. 1/1",

�'.1�··�ir�1:· ' q���s

ai�

d 5 ';i�es�

er.��ru?:/�i� ilf�!

on leading edge. Durable, shatterproof, and

transparent. Siz:e 41/1" x 63,4" . $1 .50 EA.

-� ........ .

.,,

· ,I

.. I t

<>;:========='.' <> • -<>�-------I <>c::::========>"n <>

Canta=- 42-;;eZon ;;'ile�ir�s ;:;.1n;i'n -

,�--------

-------.

sizes from 1/32." to 2" in diameter. Each circle size is clearly niarked; all hav� center guide lines. Top leading edge Qltemplate is 7" scale, graduated In 16ths. BOtUrm leading edge Is graduated .up to 18 centimeters. Right and left edg.es or template. contain lOths and 50ths engi­neering graduations , Fine quallty matte finish non-glare tinted green vinyl plastic . . 030 thick. Overall size 8" x 4 3/4". Individually packaged In polyethel}?ne sheath._

NO. 435 $ 1 . 00 ea ..

·--· ••••••••••••••••••••••· · · · · · · · · · · · · · · ·

No. 77R E L L I P S E M A S T E R Projections of 25°, 350 16' , 450 and 60o.

·contains 60 el l ipses ranging in sizes from. · l/4"to 1 ·3/8". Each ellipse precision m illed rti'j���������:;;_��to engraving machine accuracy.Size 5" x 10·7/16".THICKNESS .030 $2.50

422 D DO-ALL TEMPLATE -

Mode of GREEN tronsoorent oles·

tic. .030" thick. Size 4 \/7" x 6".

4330 DO-ALL TEMPLATE -

Some as No. 422 except made of

CLEAR plastic.

$ 1 .00 EA.

. . e . e • • • • • � . !• • • • • • . . . I·····-·• • · · · · · !. . .. _. • • A _. . "" - -­• ' , __ ,...

Tips and Techniques

DRAFTING AIDS

Helpful Drawing Techniques

Simplifying Drafting Practices

Protecti ng Prints and Drawings .

Tips for Drawing Lines and Curves

Modifying Equipment for Extended Use

Getting the Most from Drawing I nstruments

A Reprint From

No. 3 f Electroneer Dtagramatic elements of eledronic and cathode ray tubes are provided and all t,lectronic syr.· bols. -4 % • • 6 % •-.0-40 thick $3.00

- - ·- - - - - - - -

No. 1 35 Alphabet Template Block leften >/8 " High. Size 61/4 " x 33/4" , . . . . . . . . . . . . . . . . . 1 .50

No. 401 Electronic Symbols Contains the latest revisions in Electronic Sym· bols, Milled from .020'� Mott finished green plastic . . Size 5 1/4 " x 9 'fi. . . $3.85 Ea.

.. . ... JI' •10' .,. 40' 4S' ... n• w -- - - • • • • • •-- • . • • • • •• - • • • - - . . • • • - - . . . . • •- - . . . . e . .- : : . : . .. ·IXl·ALL ILLIN[ OUIO[

No. 20 1 DU-ALL ELLIPSE GUIDE Contains 80 small ellipses from 15° through 60° . Milled from .020" matt finished green plastic. Size 3" x 5'h'' $1.85 ea.

VOLUME I

2

6

1 3

1 6

20

27

1 956 - 1 957

Copyright 1 956- 1 957 by The Penton Pub l ishing Co. , Cleveland 1 3 , Ohio

ALVIN X-ACT 5 " POCKET SLIDE RULE

Machine divided prec1s10·1 graduations deeply engraved with black and red scales. Fabricated of pure white Oivinyl Plastic dimensionally stable and resistant to acids, oi ls , etc. Complete 5" ru le with scales K , A ,8, C i , C, D, S & T. Smooth riding Cursor, specia l ly designed chrome finish frame wil l not s l ip off rule. Furnished with leather sheath with simpl ified instructions.

NO. 222P . . . . . . . . . . . . . . . . . . . . . . $4.95 EA.

10" ALL-PLASTIC STUDENT MANNHEIM

NO. SR400

NO. SR400 1.4" thick. pla11ic bracket,. plain back. $ 1 .95 ea.

10" ALL·PLASTIC STUDENT BASIC TRIG

ADJUSTABLE "A" SCALE

Ill--- --'-: 1�:�·l; · ;·;' '1-'1

l.;· ;�·;l .

I U.1 , , , . l.. . tl f, . , . l , .I· . � ....

IJ<--- - --''!c..'/'� ;�·,; !\;' ·,·� :' �, 0 L r-•,.....� , ...-�•r�

-SR-600-NO. SR600 AdJu•table acalea divided Into degrees and minule1. 20" S "scale. AdJu1tabJe· cuu�r. Ideal tor all arlthmellc. ffiechanir:al and navigational problem,. $4.95 ea.

10" ALL-METAL PROFESSIONAL LOG LOG

NO. SRl 3 1 1 Magnesium alloy core with white nllrale facing•. Adjustable 2-color 1calea. Double cursor. C-D acalea on both aidea. Sc�des: L-LLI-DF-CF-CI F-CI-C-D-LL3 and LL2 on one side in register

with LLO <!ind LLOO-A-8-K-CI-C-D-S,ST and T on reverse side. Complete with leatherene sheath $13.95 .ea.

"Cj)UIC·KLEEN" DRAFTI NG

CLEAN I N G POWDER

ALVIN

STEEL PENC I L

POINTER

Select Drawing Scoles and Slide Rules 10l[W00D WIDTE EDGE - ENGINE DIVIDED

Our finest profenional grade triangular Boxwood 1cale,

.(

of 1uperior workman1hip and appearance, facea completely embodied in while pla11ic for durability, engine divided for abarpneu of gradua\ion1, diviaiona ol precise accuracy with colored furrow, for quick choice of dHired 1cale, , improved dHign.

ABCHITECTS' OPEN DMDED No. z•1-12 in. Divided: 3/32, 3/16, 1/, . 1/, . 1/t , I. ¥., >/, ,

1 1/1, 3" lo the fool. one edge divided to l6th1.

l,1,1i11l ,1,1,1,l,1i1 ,1 rt1i1,1il,11i111li1,11111lt1,1iltl!L1ilwlilt!

ENGINEEIIS' CHAIN SCALES - FULLY DIVIDED No. 241-12 in. Divided: 10, 20, 30, 40, 50, 60 parls to

the inch.

BOXWOOD WHITE EDGE - ENGINE DMDED

A very popular scale tor lhe Professional with oppos1le beveled edges SupplLed in polished ftntshed Boxwond with while gloshc edges Engine 01v1dcd graduations that are sharply engraved These scales are of a superior qualily i n hmsh and desion

No. ZSS-12 i n. Divided (double numbered) full size, t 1 2·· ·.:. I It l inches lo ! 61hs. ( l f.ths acluall Holl size ( 6"' - � l lt.l inches to 1 6ths (32nda octuall .

MECHANICAL DRAFTSMEN"S - FULL T DIVIDED •110. 258-1 2 in. D1v1ded . full size, inches reading to 32nd1.

Full size, inches reading to 50th1.

BOXWOOD WHITE EDGE - ENGINE DIVIDED flat. lour bevel Boxwood scale beautdutly hnished wit�

embodied plashc edges A high grade prolessional and lechn1cal scale of unsurpassed workmanship Engine divided graduations clearly engraved lor eai;y lcg1bd1t y, durable construchon for lasting r;ervice

ARCHITECTS. - OPEN DIVIDED No. 250-12 in Divided 1,, . 1/t . 1/i. I, 'I, . 1,, , ] If: . and 3"

to the loot ENGINEERS' CHAIN SCALES -·ruLLY DIVIDED

No. 261-12 in Divided 1 0, 30 . 40 and 50 parls lo the inch.

BOXWOOD WHITE EDGE - ENGINE DIVIDED rour bevel Pocket Scale, w:1 h plastic laces embodied ever sea

soned Boxwood The ideal pocket scale. 1nciispens1ble ic proless1onal

�nd technical men in the held or on th� Job Engine d1v1ded gradua-11<:>ns are precise and clearly engra�·eci for lasting wear. in strongly sl 1 lched genuine lealher sheath, conveniently earned 1 n onc"s pocket Truly a versatile & m. scale supplied in various graduations to cover moat phas,is ol measurement.

ARCHITECTS" - OPEN DIVIDED No. 266-6 in. Divided: 1/e , I/• , 1'2 , 1, %, l/4 , l 'h , and 3"

lo the loot. ENGINEERS" CHAIN SCALES - FULLY DIVIDED

No. 267-6 in. Divided: 10 , 30, 40 and 50 parts to the inch. (double numbered)

Nos. 240 - 24 1

$4 .75 ea.

A good quality gr::!�:�g��r 1cale for bolh Colle-.c giate and Vocational use. Made of choice bo:rwood neatly poli1hed to a natural finish and graduated clearly for preci1e mea1uremenl. Heavier atyled conalruclion regular deaign.

ABCHITECTS' -

OPtN DIVIDED No. ZIZ-12 in. Divided, 3/32. 3/16, >/, , 'I,, it,. I, \\, ¥,,

l l/1 , 3" lo the loot, one edge divided lo 16tba.

ENGINEEB.S' CHAIN SCALES - FULLY DIVIDED No. 213-12 in. Divided : 10, 20, 30, 40, 50, 60 parts lo

the inch.

No. 2300

NO. 306

MECHANICAL DIIAFTSNEN'S - OPEN and FULL DIVIDED No. 212X· 12 in. Divided: ¥. , l/4 , 1/,, 1/• , 1/J, I, SO. half and

lull ..... $ 1 .:2s ea.

ERASING �HIELDS

Packed 1 Doz. to a Box

Individually enveloped.

$.20 ea.

- � � ­· - ·- - - . . �- •,..--... - - -

NO. 3296 FLEXIBLE STAINLESS STEEL ERASING SHIELD. Made of the finut material .005" thick, highly polished, with 16 aperture1 of voriou, si.J,I", to allow oc.curate erarnrei. Si1e 2 1/i" x l l/,1 ". For cleaner drawings, sharper lines,

and better prints. Ideal for preventing and removing soil on drawings. Ory cleans tracings and art work. Keeps drawings clean without lessening their sharpness. Recommended for cleanser of old dirty drawings . . . .

Th, "Ev•lut" Multi-File. S in. lonq. ldul $.35 ea.

314'' x 1 0 yds. 'Ii" x bO yds. %" x bO yds.

$. 35 EA. $ 1 .00 EA. $ 1 .20 EA.

$ 1 .55 EA.

SEMI-CIRCULAR AND CIRCULAR PROTRACTORS

NO. 1 246 $. so

Canister witb shaker top (2" x 211, " )

N O . 1 247 $3.00 I lb. container with metal pour spout

"SUl'ER" l-WAY ,ocKET PENCIL SH.U '(NER �fay Be Co1r,ied In Your Pod•f, Pu11e, Or 8r,.fcue

• COMPACT

• CLEAN

• RELIABLE

1et In plastic • Packed In oltractive lhree-calor

carlon1

NO. 6132 $1.00 ea.

pencil le,d poinhr, eruer clean,,. tad lifter or h,ndy lethr open••· Pr.cliul end inde1huclible. Economic,lly priced.

DUSTING BRUSHES

NO. 1 248 $.65 EA.

I " x bO yds.

TRANSPARENT

I R R E G U LAR C U RVES

Professional quality, .060 thick, hand finished acrylic. Individu­ally wrapped.

Extra heovy .090 tronsporent plostic protractors with cut­out cenler .and bev­eled outer edge. Accurate gradua­tions printed be­tween two lominat­ed sheets cannot

PROFESSIONAL GRADE rub off. NO. '76 SEMI-CIRCULAR PROTRACTOR 6"· SI .00 ea. NO. ]76 ••oTA•CTOR •.. $ .30 ea.

NO. L666

fOI ,n,rc, HNCll lfTIUING OjJ(tlOIIUINl,"lf\lYH T 11 SUlto'l la•••tft�IJ�,a" .,.,,,1 u�•• r o

Al)CIEGHJKLMNt,, ,STUVW11Vl23-4�7e•tl * Al3CIEGHJKLMNI� � ,STUVWX'fZ23"1�i7••91.

NO. 360Y DO·ALL LETTERING GUIDE Three sins, '/1", 3/1&", and 1/4" upper case letters and numbers with 1/1" lower case let­ters, all on one quide. Size's 1¥1" x 9l,4" x .020". $2.60 EA. NO. 3605 Same as above with slant letters.

$2.60 EA. NO. 260V Same as above without lower case

letters · . . . $2.20 EA. NO. 2605 Same as No. 260V, but with slant

letters . . , $2.20 EA, NO. 460V 31," Letters and Numerals. .

$1 .50 EA. NO. 560V 5h" Letters and Numerals

$1 .75 EA. NO. 1 60G GrHk Lettering . . . . . . $2.50 EA,

No. 50 Pocket Pal -.o3o thick s 1 .00

Useful circles, hexes, deltas and squares. Cul ouls scaled from 1 /16" up lo 1 •. 3-5/16" x 5'

No. 57. Screw Head Template

1 3 he•ogons, 1 3 circles, 13 cul outs ond 9 Jquore, 7 % " • 5"-.030 lhic\ $2.00

HOUSE

PLAN

TEMPLATE

No. 30T

$1 .50 EA.

Scale: 'I•" = l 'O" Size 51/4 " x 63/.,". Used for circles

_. rec�angles, spacing, roof pitch gage,

plum�mg fixtures, doors, kitche'n equipment, electric symbols, and stairs.

ALVIN . . • Handy Drawing Templates

TRU, CIRCLE TEMPLATE GUIDES Draws circles quickly, easily, accurately. No. 445 circle master template contains 44 circles grouped In progressive sizes with Increments In 64ths, 32nds, 16ths and 8ths, 4ths and 1/2". Circle diameter sizes from 1/16" tp 3". Four corners of template precision cut to give radii 5/B", .3/4", 7/B" and 1" diameters. Fine quality matte Cinlsh non-glare acrylic vinyl plastic . 030 thick. Rigid, durable and shatter proof. Overall size of template 7" x 9 1/4". Precision milled circles with ailowance for pencil clearance of 1/32". Each circle size clearly marked; all have center guide lines. Assures neat accurate circles. Template Is supplied in sturdy card folio.

NO. 445 - · $2. 50 ea. J

NO. 440 LETTERING-SLOT-GUIDE Made of .060" thick acrylic material. 1/1",

�'.1�··�ir�1:· ' q���s

ai�

d 5 ';i�es�

er.��ru?:/�i� ilf�!

on leading edge. Durable, shatterproof, and

transparent. Siz:e 41/1" x 63,4" . $1 .50 EA.

-� ........ .

.,,

· ,I

.. I t

<>;:========='.' <> • -<>�-------I <>c::::========>"n <>

Canta=- 42-;;eZon ;;'ile�ir�s ;:;.1n;i'n -

,�--------

-------.

sizes from 1/32." to 2" in diameter. Each circle size is clearly niarked; all hav� center guide lines. Top leading edge Qltemplate is 7" scale, graduated In 16ths. BOtUrm leading edge Is graduated .up to 18 centimeters. Right and left edg.es or template. contain lOths and 50ths engi­neering graduations , Fine quallty matte finish non-glare tinted green vinyl plastic . . 030 thick. Overall size 8" x 4 3/4". Individually packaged In polyethel}?ne sheath._

NO. 435 $ 1 . 00 ea ..

·--· ••••••••••••••••••••••· · · · · · · · · · · · · · · ·

No. 77R E L L I P S E M A S T E R Projections of 25°, 350 16' , 450 and 60o.

·contains 60 el l ipses ranging in sizes from. · l/4"to 1 ·3/8". Each ellipse precision m illed rti'j���������:;;_��to engraving machine accuracy.Size 5" x 10·7/16".THICKNESS .030 $2.50

422 D DO-ALL TEMPLATE -

Mode of GREEN tronsoorent oles·

tic. .030" thick. Size 4 \/7" x 6".

4330 DO-ALL TEMPLATE -

Some as No. 422 except made of

CLEAR plastic.

$ 1 .00 EA.

. . e . e • • • • • � . !• • • • • • . . . I·····-·• • · · · · · !. . .. _. • • A _. . "" - -­• ' , __ ,...

Tips and Techniques

DRAFTING AIDS

Helpful Drawing Techniques

Simplifying Drafting Practices

Protecti ng Prints and Drawings .

Tips for Drawing Lines and Curves

Modifying Equipment for Extended Use

Getting the Most from Drawing I nstruments

A Reprint From

No. 3 f Electroneer Dtagramatic elements of eledronic and cathode ray tubes are provided and all t,lectronic syr.· bols. -4 % • • 6 % •-.0-40 thick $3.00

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No. 1 35 Alphabet Template Block leften >/8 " High. Size 61/4 " x 33/4" , . . . . . . . . . . . . . . . . . 1 .50

No. 401 Electronic Symbols Contains the latest revisions in Electronic Sym· bols, Milled from .020'� Mott finished green plastic . . Size 5 1/4 " x 9 'fi. . . $3.85 Ea.

.. . ... JI' •10' .,. 40' 4S' ... n• w -- - - • • • • • •-- • . • • • • •• - • • • - - . . • • • - - . . . . • •- - . . . . e . .- : : . : . .. ·IXl·ALL ILLIN[ OUIO[

No. 20 1 DU-ALL ELLIPSE GUIDE Contains 80 small ellipses from 15° through 60° . Milled from .020" matt finished green plastic. Size 3" x 5'h'' $1.85 ea.

VOLUME I

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Copyright 1 956- 1 957 by The Penton Pub l ishing Co. , Cleveland 1 3 , Ohio

.. ALVIN ... Lead Holders, Lead Pointers, and Refill Leads

Enlarged View of non·slipping lock· clutch lead grip.

Instantly ejects lead simply by pressing button at top of barrel ... upon release it automatically grips lead firmly and secures

it at any desired position ... "positive-action-clutch" holds lead firmly and will not shear or weaken lead.

Non�rolling, form-fitting knurled shaft makes for easy handling. Hard rubber featherweight barrel assures perfect balance and years of service .. .

and will hold any standard size drawing lead. Knurled nickeled furrows complement the jet black finish and modern design . .. colored plastic washers instantly identify lead degree ... comes

with or without pocket clip.

Holders supplied with lead in degrees B to 9H.

No. 5020, $1.35 each, $16.00 daz. 6 ;nches long No. 5021, $1.45 each, $17.00 daz. 6 inches long With clip No. 50215 $1.45 each, $17.00 daz. Packet Model 5 in With clip

Feather (IT Weight

ol only f 1/, oz.

1 Pen ... 6 Line Widths

TECIIA&IJAPII FOUNTAIN PEN

• Writing Ink • Drawing Ink • • India Drawing Ink • Waterproof Ink e For drafting, lettering, art work and general writing. Provides a continuing supply of ink thereby reducing the time now being taken bv continual refilling. This same time problem applies to freehand lettering, lettering with the use of guides, and also template work. TECHAGRAPH. is filled directly from your ink bottle, and is easily cleaned.

• Reproducing • Ozalld • Blueprints • Etc.

NO. P395 ......... EA. $4.75

Point section only 1.50

AL VIN TECH-LETTER-GUIDES

lettering is quicker, neater, more uniform with Alvin .. Tech-Letter Guides". Vertical letters, (upper end lower case) and numerals. Durable transparent green tinted plastic with raised aluminum metal edging for rigidity and to prevent ink smeors. For use with Alvin Techagraph Fountain Pens. Seven guides to a set.

.NO. TG7\ LETTER GUIDE -SETf20.oo

Flo(f)

Unconditional Guarantee for Mechanical Perfectiqp the CONSTRUCTOR FLAT PROPELLING DRAWING PENCIL NEVER NEEDS SHARPENING! Extended guide edge for straight edges and triangles assures extremely accurate work at high speed ... represents a new concept in drawing pencils ... sharp uniform lines can be urawn wilh even density ... flat ribbon lead in­serts are only .016 thick and .047 wide and can be used to last fraction of an inch. Excellent for block printing, drafting, graphs, charts, plans, accurate pencil work. Made of finest hard rubber for lightness and durability . .. tops arc stamped and ..,,,..-, various colored rings are supplied for instant selection of different grades of lead // -::=='i'��;ll� hardness ... form-fitting knurled shaft makes for easy handling. I , Especially designed for graphs, charts, plans, drafting. Assures clean hands, clean work. \ /

, ...... _--< II'--------Smoother, longer lasting PARAMOUNT-CONSTANT Flat Ribbon Lead Inserts: II[ "Wii(p-Degrees; HB, H, 2H, 3H, 4H, and 5H. I doz. leads to a tube

No. 5022, $2.75 each, boxed with a lube of 1 doz. leads, $32.00 doz. Enlarged view af the "CONSTRUCTOR" extended guide edge.

No. 5011, 35c tube, $4.00 doz. State hardness when ordering.

'ALVIN'S NEW

"KLEEN-POINT" POCKET LEAD POINTER

NO. 5555, LEAD POINTER $1.95 each. $22.00 daz.

NO. R555B, BLADES 25c set of 4, $2.75 doz. seh

A convenient, handy, compact pocket poi;iter ... easy to operate . : . four tempered steel blades assure perfect, clean points every ti.me ... graphic cup retains lead particles, and is easily removed for cleaning ... guide tube prevents snapping ... non-rolling square design . . . made of durable anodized aluminum 34" thick, 2 '/2 • long ... a pointer for every­one in the home, office, shop, school or field.

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No. 5018

ALVIN'S "PARAMOUNT" REFILL DRAWING LEADS LEAD THE WAY

Select from 18 degrees of hardness from 78 to 9H

manufactured with utmost care ... choice top grade imported refill drawing leads of superior quality and drawing strength ... dense, uniform lines guarantee perfect drawings and sharp blueprints without inking. Standard diameter, pointed leads, 5 inches long, fit any standard make of lead holder or artist pencil.

No. 5018, $1.00 per tube 1 doz. packed refill leads, $11.00 doz. tubes

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PREPARED CqMPASS LEADS IN TUBES made especially for all types of drawing instrumcuts ... standard diameter, 11/.i" long, with chisel sharp points ... neatly packed in clear plastic tubes. D_egrees: HB, H, :ZH, 3H and 4H No. 5112, 1 doz. leads per tube, $1.75 doz. tubes

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No. 5144

PREPARED COMPASS LEADS IN BULK Ideal for schools, industries and commercial use . for economy and compact usefulness. Packed 144 leads in wooden box with slide top. Degrees: HB, H, 2H, 3H, and 4H No. 5144 , $1.00 per box, 1 degree only per box