624] Comparison of water purged of air by boiling and plain water. Jan. 12. Salt in 2999 in tube 12. Salt in 150,000 in tube 20. The water was then boiled over lamp in the same vial in which it had been kept some time, and then cooled in water and compared in the Therefore if anything water conducted better before boiling than after, but the difference might very likely proceed from the error of the experiment. In order to see whether the water had absorbed much air by being exposed to the air in the trial, some of the boiled water was exposed to the air as much as that which was tried in the tube was supposed to have been, and boiled over again in a vial. It did not begin to discharge air till it was heated to 190°, and then discharged but little. Some more of the boiled water which had not been poured out of the vial seemed to discharge as much air. But some distilled water which had not been boiled began to discharge air almost as soon as heated, and discharged a great deal before it began to boil*. 625] Comparison of water impregnated with fixed air and plain water. Some distilled water was impregnated with fixed air produced by oil of vitriol and marble, and compared with salt in 2999 in same tubes and manner as in former experiments. that this. 2.3 of sal Imm. 382 of sal Sylori 3.17 of quads nitre 2. 21. of glar calcined glaub. salt & 14.10 of call. S.8 At were dissolved in water the solut. of each being 3.10.12 that is such that the quant. acid in each should be equiv. to that in a salut. salt in 29 of water with salt in Jan. 13 Sal lytrei tube 1522 5. 415 7 7,7 8,2 m tabe 15 comp. 29 in tube 22 el. = 2 th. 55 but doubt. 18,2 seemed gr. seemed less but doubt plaints less The same water deprived of its fixed air by boiling, and tried as before. 626] 2-3 of Sal. Amm., 3.2 of Sal. Sylvii, 3·17 of Quadr. nitre, 2.21 of calcined Glauber's salt and 14.10 of calc. S. S. A.† were dissolved in water, the solution of each being 3.10.12, that is, such that the quant. acid in each should be equiv, to that in a solut. salt in 29 of water. Jan. 13. Sal. Sylvii in tube 15 compared with salt in 29 in tube 22. * [See Art. 693.] plainly less. sensib. less. plainly greater. plainly less. scarce sensib. less. + [See facsimile on the opposite page. The results are given in Art. 694. See Note 34 and Preface.] 627] 20 of oil of vitriol, 2, 5-10 of spirit of salt 2, and 5.19 of f. alk. D, were diluted with water, the solution being 3. 10. 12. Consequently the quantity of acid in 2 first were equivalent to that in salt in 59 of water, and the alk. in last was equivalent to that in salt in 29; compared in the same manner as the former. Another diluted spirit of salt was made of same strength as the former. Being tried with wires at 9.9 inch. distance no sensible difference was perceived, which agrees with former. Another diluted oil of vitriol was made and tried, Jan. 16. |