. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. rep. (Ph. Bat. 1805.) From prepared lard, 16parts, melted over a slow fire, and then mixedwith nitric acid, 1 part; the combinationbeing promoted by constant stirring with aglass rod, until it ceases to affect litmus should be extremely white, and sho
. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. rep. (Ph. Bat. 1805.) From prepared lard, 16parts, melted over a slow fire, and then mixedwith nitric acid, 1 part; the combinationbeing promoted by constant stirring with aglass rod, until it ceases to affect litmus should be extremely white, and should bekept in the dark. See Ointment of Nitrio ACID. OXYHYDROGEN BLOWPIPE. See Blow-pipe. Deville and Debray ( Ann. Ch. Phys.[3], Ivi, 385) employ the oxyhydrogen blow-pipe in the following manner for effecting thefusion of platinum and the refractory metalswhich accompany it. The apparatus con-sists of the blowpipe C (see below), a furnaceABD, and a crucible GUI. The blowpipeis composed of a copper tube about half aninch in diameter, terminating below in aslightly conical platinum jet about 1^ inchlong. Within this tube, which is suppliedwith hydrogen or coal-gas through the stop-cock M, is a second copper tube C for supply-ing oxygen, terminated also by a platinumnozzle with an aperture of about a twelfth ofan inch in 77 1218 OXYMEL The furiiace ABD consists of three piecesof well-burnt lime of slightly hydraulic quality,which may be turned at a lathe with ease. Thecylinder A is about 2| inches thick, and isperforated by a slightly conical hole into whichthe blowpipe fits accurately, passing abouthalf-way through the thickness of the second somewhat deeper cylinder of lime, B,is hollowed into a chamber wide enough toadmit the crucible, and leave an interval ofnot more than a sixth of an inch clear aroundit. KK are four apertures for the escape ofthe products of combustion. The outer crucible IIB. is also made of lime,but it contains a smaller crucible I of g
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