216 



L. CASELLA'S CATALOGUE 



2534 HYDBOMETEES, a pair of, as No. 2533, in mahogany case, the scales ranging from 

 to 20, and from 20 to 40 . . . . 12 6 



2535. Twaddle's Hydrometer (glass), pear shaped, CASELLA'S improved, small and 



strong, with ivory scales, No. 1 to 3, 2s. 6d. each ; No. 3 to 6, each 030 



2536. The set of 6 in mahogany case . . . . . ( 



2537. BOUND CAEDBOAED OE TIN CASES, each 



No. 1 



2 



3 



Kange 



24 

 , 48 



to 



24 

 48 



74 



No. 4 

 5 



, 6 



Kange 74 



102 



138 



110 

 003 

 to 102 

 138 

 170 



The Twaddle's hydrometers*, are so called after Mr. Twaddle of Glasgow, who first designed 

 them ; the graduations extend from or water to 170, on 6 separate hydrometers, as shown in 

 Nos. 1 to 6, each division representing 5 of sp. gr. For manufacturing purposes the arrangement 

 is most convenient, the graduations heing distinct, and workmen required to test various 

 gravities do so with one number only, without endangering the whole. To find the gravity 

 of any part of the scale, say 140, multiply it by 5 placing 1 in front, thus 140 by 5 700 , 

 with 1 for water in front = 1700 sp. gr. 



* Twaddle's hydrometers, and Beaumes's hydrometers and saccharometers adjusted to 84 

 Fah., for the West Indies, 6d. each extra. 



2538. Hydrometer, for heavy fluids, with specific gravity scale, 1000 to 1900, and 



Beaumes's scale, to 70 (jigs. 2538), p. 215 .- . 076 



2539. HYDEOMETEE, for light fluids, with specific gravity scale 1000 to 800, and 



Beaumes's scale, 10 to 45 . . . <, 076 



2540. BEAUMES'S HYDEOMETEB, to 45 for syrups, soap, leys, etc. . 056 

 This hydrometer being extensively used abroad, as well as in connection with chemicals 



imported into this country, the following short comparative tables will be found convenient. 



SPECIFIC GEAVITIES COBEESPONDING TO DEGBEES OF BEAUMES'S HYDEOMETEE 

 FOE LIQUIDS HEAVIEE THAN WATEE. 



2542. SACCHAEOMETEE, for sugar-hoiling, Beaumes's scale to 40, of stout brass gilt, in 

 tin case . . . . . - 1 8 



