THE NEW PERKIN-ELMER®

MODEL 221 INFRARED

SPECTROPHOTOMETER

gives every chemical laboratorythe finest in accuracy,

ease and versatilityof infrared analysis

Newest in Perkin-Elmer's line of analytical aids, theModel 221 assures that your laboratory - with this in-strument - can achieve and maintain a strongly compet-itive position in the field of infrared chemical analysis.The powerful Model 221 offers completely new conceptsof automatic spectrum control, analyst convenience,push-button ease of operation and designed samplingversatility.

In speed of analysis, in number of analyses per day,

in first-time accuracy of determinations - the Model 221is ieady to bring a totally new dimension of infraredanalysis to your laboratory, give you more useful infor-mation - faster. Send today for full details, includingmore remarkable spectra like that below.Features of the Model 221 include:* New Automatic Gain Control * New Programmed Scanning* New Automatic Speed Suppression * New 2-minute prism/grating interchange * Ordinate scale expansion and compres-sion * New sure-acting P-E recorder pen.

IN S T R U MEN T D I V IS I ON

Perkin-Elmer ,N 0 R WA L K C O N N E C T I C T

SCIENCE, VOL. 12!2934