[6] Saturated solution and salt in 69 of water (the new solutions) compared in the same manner, only using the jars 1 and 2 instead of the battery; with the tubes 5 and 17. Therefore saturated solution conducts 10:05 times better than salt in 69 of water. 618] The electricity of the 6 jars was found to be as much diminished by being communicated to 3 rows of the battery as that of 1 row is by being communicated to 4 rows, therefore quantity of electricity in the 6 jars is to that in one row as 3 to 4. Exp. 7. Saturated solution and salt in 69 (the new solutions) tried in the same manner with battery; 1 row being electrified to 2, and its electricity communicated to remaining rows, and one row used at a time. Tried in tube 5 and 17. [R. = 25300.] 3.95 supposed right. Therefore sat sol. conducts 10:31 times better than salt in 69. Exp. 8. Saturated solution compared with salt in 29 in tubes 22 & 23 with Nairne's jars. Electrometer 1. Th. 63. [R. = 65000.] 23 22 3 The bore of that part of tube 23 which was used is supposed 80 greater than that of whole tube together. Therefore sat. sol. conducts 3.51 times better than salt in 29 of water. Exp. 9. The solution in 29 diluted with 1 of water, id est, solution of salt in 69, compared with sat. solution in same tubes. Therefore sat. sol. conducts 7.79 times better than the diluted solution, and the diluted solution conducts 2-2 times worse than solution in 29. Exp. 10. Saturated solution compared with salt in 69 in same tubes. Therefore sat. solut. conducts 9:02 better than the solution in 69. 619] Examination whether salt in 69 conducts better when warm than when cold. Salt in 69 in tube 17 placed in water; solution in 29 in tube 23 out of water, the distance of wires in tube 17 being not measured, but remaining always the same. Therefore salt in 69 conducts 1.97 times better in heat 105 than in that of 581*. 620] Examination whether the proportion which conducting power of sat. sol. and salt in 999 bear to each other is altered by heat. Sat. sol. in tube 15, salt in 999 in tube 19, both in water; distance of wires in tube 15 not altered. Therefore the proportion seems very little altered by heatt. 621] Jan. 1, 1777. Salt in 2999 of water compared with water distilled in preceding summer in tubes 12 and 20. 1.5 43.5 1.95 1.4 Electrom. = 4. rather greater. Column of 1.6 in tube 20. plainly less. Supposed equal to 43.5 in tube 12. greater. Therefore allowing for different bores of tubes, salt in 2999 conducts 24 times better than distilled water. [By the experiments of Kohlrausch, this ratio would be 1:59. See Art. 691 and Note 33.] [This agrees with the results of Kohlrausch.] Jan. 2 M. had been left in 20 1.4 1.9 2.1 Same experiment repeated with the same water, which the tubes all night. Therefore salt in 2999 conducts 22 times better than distilled water. The same experiment repeated, only the water in the tubes was changed for fresh by pouring out the old and putting in fresh by small funnel, without taking out the wires. Therefore salt in 2999 conducts 72 times better than distilled water. The same experiment repeated, only the distilled water changed for that used in the preceding year. •4 1.1 considerably greater. plainly less. 8 supposed equal. Therefore salt in 2999 conducts 47 times better than distilled water. Jan. 3. Experiment repeated with the same water left in. Therefore salt in 2999 conducts 38 times better than the distilled water. The distilled water changed for the new distilled water. Therefore salt in 2999 conducts 86 times better than distilled water*. Salt in 2999 compared with salt in 150,000 in same tubes. 1.2 43.5 sensib. greater. Electrom. = 4. Therefore salt in 2999 conducts 26 times better than salt in 150,000. The experiment repeated with the same waters, only the wires in tube 12 brought nearer. .est. ation whether comparative resistance of salt in 2999 000 was the same when tried in the above-mentioned assed through 2 wires in glass of water, as in fig.* ubes 12 and 20 filled with salt in about 105 of water: of water in glass. 2 jars electrified to 13 and communi 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*. If the distance of wires in tube was (31.5 (less greater than through wires in glass. 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. { S ·5 shock was (greater than through less 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. shock was plainly (greater than through tube 12 with wires at 42.4 inches distant. 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 45°. 623] Exp. 11. Saturated solution in tube 14 compared with salt in 149 of water in tube 15. Tube 15 14 Electrometer at 31. Th. = 45. 1.6 41.8 sensib. greater. 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.] of salt in 2999 & salt in 150 & salt in 15 de water, which same when Truex in above menti of when passed through a wire. I fig. 2 H lass of water as in Jan. 6 The Tubes 12 & 20 filled with salt in about 105 of water salt in 150000 of water glass 2 gard to 12 & Commun. to rest If dirt wires in tube 12 was in was less senib. wires in glass .3 33,5 1815 the shack tham that through the The same tried as before only with the gars el. to 24 The shock received with shock metter If dist wires in tube ovas greater than through wires in glass The glass filled with salt in 2999 & the shack compared with that through tube 20 with same sol. salt in 105 The pairs el. to 2 α received With: shook metter If dist. wines in tube 20 was shock mas ५ [greater than through wires in glass N. The Great irregularity the last experiment the cause of which Tam unacauainted with Therefore salt in 2999 conducts 2013, 5 times better than salt in 150 020 To face p. 326. |