134 _Progress of Praclical d], Theoretical 2lechanies e¢ Chemi~tr!/

trodueed into a pipe of red port wine and stirred up with it, and after a short time the wine will become fine anti bright.

A compound of three parts blood, one part bones, and one part yellow marl ; or of two parts blood, two parts animal charcoal,and one part bone, all reduced to a fine powder~ and mixed with water, may be applied in a similar way to purify white wines, cider, beer, and other liquors.

The Patentee says, in conclusion~ he is aware that blood has been used, and also animal charcoal, for clarifying saccharine liquor; he, therelbre, does not claim those~ unless combined with the other substances; but that which he particularly claims, is -producing the whites of eggs in the state of powder, and compounding them as above described." Ibid.

Description of an improverae~t in Furnaces .]'or Steam Engine Boilers~ ,~'c. By JoHN HorK1S% of London.

This is a patented improvement. ] ' h e drawing represents the furnace of a steam enzine boiler, havin~ my improved construction of the fire-bridge - - - , ~ ~ ¢:P , / . . . .

made of fire.brick~ as shown at a, the nature and construcmm ot which wdl readily be understood by an inspection of the drawing; and it will be seen that the fire-bridge, a~in place of rising up and merelyintercept!ng.the flames and heated vapours, and causing them to rise upwards and nnpmge more effectually on the boiier~ as has been the construction of ordinary fire- bridges of steam.engines, and other boiler furnaces; the bridge, a, shown in the drawing, curves tbrward, and in addition to causing the flames and heated air to pass upwards, and bring them more closely to the boiler, those flames from the ignited fuel nearest tire bridge are turned back, and have a tendency to pass towards the fire-door~ and hence the vapours arising from the partially ignited fuel must mix with and be consumed by such flames so directed by the curved construction of the flue, as above desct'ibed;and it will be evident that in marine and some other construction of boilers the fire-bridge, in place of fire.brick~ may be formed of metal, and hollow, lbr the water o{ the boiler to pass into and become heated therein, either by pipes connected therewith, or by the bridge being connected to the sides of the boiler, where the construction is such as to have the furnace within; all which will be readily understood by an engineer accustomed to the ar- ranging and constru'cting of boilers. A n d it will be evident that, although I have only shown and described furnaces for steam-engine boilers, the in- vention is equally applicable to the furnaces of other boilers wherein bridges of the ordinary construction have been heretofore used. ltepertory oflaven.