. 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. ned from the meitnof several determinations that the errorarising from this source amounts in one hourto -2\j of a milligram. In cases where the temperature of thebalance-room is high, and the expansion co-efficient of the liquid to be examined is con-siderabl
. 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. ned from the meitnof several determinations that the errorarising from this source amounts in one hourto -2\j of a milligram. In cases where the temperature of thebalance-room is high, and the expansion co-efficient of the liquid to be examined is con-siderable, it may be found necessary to put asmall cap (bead-shaped and open at both ends)over the extremity of the wider capillarytube, for the purpose of retaining the liquid,which during the time of weighing mightotherwise be lost, owing to its a cap is used the wider capillary tubeneed not be longer than the narrow one.^ The Compte Rendus ^ describes a newspecific gravity apparatus, the invention of The apparatus in question consists ofa glass vessel about 5 capacity, closed with 1 This instrument is manufactured by E. Cetti & Co.,11, Brooke Street, Holboni, London. 2 Ixxxvi, 350—352 (Juum. Chem. Soc.) VOL. U a perforated stopper like an ordinary specificgravity bottle. To the side of the vessel is. joined a tube, coming off at an angle of about45°, about 25 cm. long, and 4 mm. internaldiameter, and graduated at 50ths of a ;The vessel is filled with water, the levelof which is read off in the tube held vertically,the finger being held over the hole in thestopper; 2 or 3 grams of a mineral are thenplaced in the flask, the stopper is replaced,care being taken to lose no water, and thelevel is again read off in the graduated tube,held vertically as before. The difference inthe two readings gives the volume of themineral taken. SPECTACLES. See Eye, Vision, &c. SPECTEOSCOPE. An instrument devisedfor examining the spectra of flames. (Seeheloio.) SPECTR
Size: 1387px × 1802px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, books, booksubjectrecipes, booksubjecttechnology
