The same water deprived of its fixed air by boiling, and tried as before. 626] 23 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. scarce sensib. greater. plainly less. scarce sensib. less. + [See facsimile on the opposite page. The results are given in Art. 694. See Note 34 and Preface.] 6271 2.0 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. EXPERIMENTS IN JANUARY, 1781*. 628] Some basket salt† was dried before fire, and a saturated so 1 3.78 lution made with it which contained of salt, and also other solutions of different strengths, all being made with distilled water. Sat. sol. in tube 14, salt in 69 in tube 15. [R. = 399000.] Sat. sol. conducts 8.63 times better than salt in 69. Sat. sol. conducts 9:03 times better than salt in 69. Sat. sol. in tube 14, salt in 29 in tube 15. El. = 31. 7.3 11.0 sensib. greater. 9.1 supposed right. sensib. less. Sat. sol. conducts 4.1 times better than salt in 29. Sat. sol. conducts 3.85 times better than salt in 29. The same solutions in same tubes. El. = 1}. [R. = 136000.] Sat. sol. conducts 3.95 times better than salt in 29. * [The results of these experiments are collected in Art. 695. See Note 33.] +Salt made up in form of sugar loaves, in small wicker baskets, which is thence called loaf salt or basket salt." Rees' Cyclopædia.] [26-45 per cent. Saturated solution at 18°C is 26-4 per cent. by Kohlrausch.] Sat. sol. in tube 14. Salt in 11 in tube 15. El. 19. Sat. sol. conducts 1.92 times better than salt in 11. Sat. sol. conducts 1.88 times better than salt in 11. Sat. sol. conducts 1.92 times better than salt in 11. 629] Salt in 142 put in tubes 5 and 15 in order to find what power of velocity the resistance is proportional to. 630] Salt in 69 in tube 22. Salt in 999 in 23. Electrometer = 31. [R. = 1335000.] plainly less. scarce sensib. less. 23 22 Do. 4.3 3.6 3.7 3.4 3.2 3.4 Salt in 69 conducts 9.91 times better than salt in 999. Salt in 69 conducts 10.3 times better than salt in 999. # Salt in 69 conducts 11:31 times better than salt in 999. [This is the first experimental proof of what is now known as Ohm's Law.] |