OF SPECIFIC GRAVITY INSTRUMENTS. 217 



2543. Three Hydrometers in one set, for testing the gravity of spirits, ether, etc., 



from water to 700, viz., No. 1, from 700 to 800; No. 2, 800 to 900; No. 3, 

 900 to 1000, arranged by L. CASELLA with extreme care as instruments of 

 standard precision, 1 10s., or in one case . . . 1 14 6 



2544. A SET OF THEEE HYDBOMETEBS for heavy fluids, by L. CASELLA, of standard 



precision, as above : No. 1, 1000 to 1300 ; No. 2, 1300 to 1600 ; No. 3, 

 1600 to 1900, 1 6s., or in one case . . . . 1 10 



2545. HTDEOMETEE for spirits, with Cartier's and specific gravity scales 050 



2546. BEADS for showing specific gravity, of 1000 to 1500 every five degrees, in sets of 



any number, in round case, per dozen . . . 6 



2547- Spirit Bubbles or Beads*, for showing approximately the strength of spirits, 



much used abroad in the manufacture of rum, etc., being very strong, and 



unlikely to break, in round case, with instructions, a set of 12, 5s. 6d. ; of 18, 



8s. ; of 24 10 6 



* Spirit bubbles adjusted to 84 Fah., ditto, ditto, without extra charge. 



2548. PASTING GLASSES OB SINKING PHIALS, for East India, per dozen 070 



2549. SALT-WATEE BEADS OB BUBBLES, for aquariums, in pairs (Lloyd's arrangement) 



with instructions . . . ._ . . 020 



2550. AQUABIUM HYDEOMETEB (LLOYD'S), for adjusting the salt-water to its proper 



density . . . . . . . 026 



2552. Argentometer, for ascertaining the proportion of nitrate of silver, in solution by 



chloride of sodium, for photographic purposes, 7s. 6d., or in morocco case 



12 6 



2553. PHOTOGEAPHIC HYDEOMETEB, for showing grains per ounce of nitrate of silver 



in solution . . . . . . . 046 



2554. HYDEOMETEES, SACCHABOMETEBS, and ALCOHOLMETEBS, according to Beaume,. 



Tralles, Richter, Gay-Lussac, etc., for showing the strength and gravity of 

 fluids both heavier and lighter than water ; from Is. 6d. to 2s. 6d. each, in 

 every variety. 



2555. SPECIFIC GEAVITY BOTTLES, of 1000 grains capacity, with counterpoise, in tin 



case, japanned, 10s. 6d. ; ditto to 500 grains, 8s. 6d. ; ditto to 250 grains, 

 6s. 6d. ; ditto to 100 grains, 5s. 6d. ; ditto to 1 cubic inch. . 056 



2556. SPECIFIC GBAVITY BOTTLES, of stout glass, with solid stoppers, with a slit 



down the side, at the same price. 



2557. Nicholson's Gravimeter, in japanned tin, for showing the specific gravity of gold, 



minerals, etc., with marked stem and directions for use . 076 



2558. NICHOLSON'S GEAVIMETEE, very accurate, in glass or gilt brass, for showing the 



specific gravity of gold, metals, minerals, or other solid substances, with silver 

 cup and weights, ranging from ^- of a grain to 1000 grains, in case, complete 



220 



UBINOMETEBS ; the great care taken by L. CASELLA in the design, as well as pre- 

 cision of these instruments, obtains for them a decided preference wherever 

 they are tried. 



2560. UBINOMETEB (PEOUT'S) for ascertaining the specific gravity of urine, strong and 

 very sensitive, in sheath case .... 3 6- 



