39C 



NEGEETTI AND ZAMBRA, HOLBOEN YIADUCT, EC., 



FIG. 2153. 



Sets of, seepage 400. 



CHEMICAL AND PHILOSOPHICAL INSTRUMENTS AND APPARATUS. 



2151 Balances, Chemical, with Glass Cases, highly finished and carefully adjusted, 



to turn with T ^th of a grain or one Milligramme 



8 8s. 10 10 12 12 



2152 Balances, Assay, with framed beam and steel knife, edges resting on 



Agate planes, sliding weight on beam, with adjustments, in Glass 

 Lantern, with levelling screws, &c., of the most delicate accuracy, to turn 

 with TTJ Voth of a grain 15 15 25 



2153 Balances, Assay or Chemical, of the highest precision, fitted with all recent 



improvements, adjustments and appliances. Plate Glass for bottom 

 of the case (fig. 2153) 35 to 50 



Decimal Weight 



2154 Balance (fig. 2154) for Assay- 

 ing, Analysis, or Diamond weighing, 

 will carry 500 grains and turn with 

 -ji^th of a grain ; all bearings of Steel. 

 In plain Glass Case, with -key arrange- 

 ment for lifting . .660 



Ditto ditto with Set Screws 

 and Spirit Level . .770 



2155 Balance for determining the 

 Specific Gravity of Fluids, whether 

 heavier or lighter than water, to the 

 third place of decimals. This Balance 



consists of weigh-beam, a plunger FIG. 2154. 



to be immersed in the fluid ; fitted with Thermometer, Set of Weights and Riders, 



Glass Solution Jar, &c., in wood case price 4 10 



