622] Examination whether comparative resistance of salt in 2999 and salt in 150,000 was the same when tried in the above-mentioned manner, or when passed through 2 wires in glass of water, as in fig.* Jan. 6. The tubes 12 and 20 filled with salt in about 105 of water: salt in 150,000 of water in glass. 2 jars electrified to 13 and communicated to the rest. If the distance of wires in tube 12 was the shock was sensibly 33.5 The same tried as before, only with the jars electrified to 2 and the shock received with shock melter*. (less If the distance of wires in tube was shock was plainly greater than through wires in glass. (31.5 (20.3 The glass filled with salt in 2999 and the shock compared with that through tube 20 with same solution of salt in 105. The jar electrified to 2 and received with shock meltert. If dist. wires in tube 20 was wires in glass. (5 11. shock was (greater than through N.B. Great irregularity was found in trying this last experiment, the cause of which I am unacquainted with. Therefore salt in 2999 conducts 31.5 times better than salt in 150,000. The same salt in 150,000 which was used in this experiment was saved and compared with salt in 2999 in the usual manner with tubes 12 and 20, electrometer at 4. If distance of wires in tube 20 was (1.2 shock was plainly 1.85 than through tube 12 with wires at 42.4 inches distant. (greater less Therefore salt in 2999 conducts 24-6 times better than salt in 150,000. The thermometer in all the foregoing experiments of this year supposed to be about 45o. Saturated solution in tube 14 compared with salt in 623] Exp. 11. 149 of water in tube 15. Sat. sol. conducts 20.5 times better than salt in 149. [See figure in facsimile of MS. on opposite page.] [The reading here is doubtful; see facsimile of MS. on opposite page. Cavendish says, Arts. 601, 602, 616, that he took the shock with metals in each hand, but the word here cannot be read "metal." The word occurs also in Arts, 585 and 637.] P.9 Examination whether comparative resistance of salt in 2999 & salt in 150000 was the same when trees in above mente and manner or when passed through a wires in glass of water as in I fin. 2 Jan. 6 The tubes 12 & 20 filled with salt in about 105 of water salt in 150000 of water in glass 2 jard to 12 & Commun. to rest If dirt wires in tube 12 evas was sensel. Eles water tham that through the wires in glass 33,5 1815 the shach The same tried as before only with the jars el. to 24 The shock received with shock metter If dist wires in tube ovas plaints less Igreater 2013 than through wives in glass The glass filled with salt in 2999 & the shack compared with that through tube 20 with same sol, salt in 105 15 The pain el. to 2 α received with, shock gretter If dist. wines in tube 20 mas 9 shock was greater than through wires in glass Less N. P. Great irregularity found in trying the last experiment the cause of which tam unacauainted with Therefore salt in 2999 conducts 2015, 5 times better than salt in 150. To face p. 326. Exp. 12. Jan. 8. Sat. sol. in tube 22 compared with salt in 149 in tube 23. 17. Therefore sat. sol. conducts 19.6 times better than salt in 149. Exp. 13. Salt in 149 in tube 5 compared with salt in 2999 in tube Salt in 149 conducts 17.3 times better than salt in 2999. Salt in 149 conducts 16.7 times better than salt in 2999. Exp. 15. tube 23. Jan. 9. Sat. sol. in tube 22 compared with salt in 29 in 6.597 supp. 35.8 in tube 23. Sat. sol. conducts 4.38 times better than salt in 29. 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. |