Page:Proceedings of the Royal Society of London Vol 60.djvu/416

Rh Expt. 2417.—Effect of Cold on A and K.

Time. Cemperature. A. K. A/K. ToVo vOlt. 0 15° _ — 7-5 1 — . - 4 *-- 2 35 + 13 — 3*25 7 — - 4 — 8 + 13 5 — 3*37 11 14 — - 4 — 12 — + 14*5 — 3*62 13 — — - 4 — 14 12‘5 +14 T» — 3 62 15 ' _ — -3 * 5 — 16 11 + 15 — 4*28 17 — — - 4 — 1 18 9 + 15 5 — 3-87 21 6 ggg — 5-5 23 4 — -3 * 5 24 3 + 16 5 4-71 27 2 — -3 -5 — 28 1-5 + 16*5 — 4-71 29 — — - 3 - 30 0 5 4 17 — 5-66 32 —. ... — — — 4*5 33 -0*5 + 16*5 — — 34 — ■— - 3 — 35 1 + 17 — 5-66 36 ■:— — -2*5 H — : 37 -1*5 + 17 — 6*8 ’ 38 - —— — -2 * 5 — 39 - 2 + 17*5 — 7 40 — • — -2*5 .. 41 -2*5 ^ +17 — 6*8 42 — — -2*5 — . 43 - 3 + 17 — 6*8 44 — —j - 2 _ 45 - 3 + 16 *5 — 8*25 48 — — - 2 — 49 ~-3 *5 + 16*5 — 8*25 52 — — — 4

The A effect obviously increases with fall of temperature (increasing resistance) ; the K effect apparently diminishes, but actually increases a little, the increase being masked by increased resistance. The A/K quotient is obviously increased. The voltage calculated from the data of this experiment is :—

At 15° A = 0-00173 volt. K = 0-00053 volt. „ 10 A = 0-00244 „ K = 0*00059 „ „ 5 A = 0-00285 „ K = 0-00064 „ „ o A = 0-00360 „ K = 0-00070 „