Table I.

Errors of the Time Ball in 1911.

- means too late.

+ means too early.

Date Jan. Feb. Mar. April. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 0.1 ... 0.1 0.1 +0.4 -0.3 -0.2 -0.3 -0.2 2 0.1 0.1 ... +0.4 0.1 +0.2 0.1 +0.4 3 0.1 0.1 0.1 0.1 +0.5 1 +0.3 +0.2 4 0.1 -0.2 +0.3 0.1 +0.5 0.1 0.1 3838 0.1 +0.8 0.1 0.1 5 0.1 0.1 0.1 0.1 0.1 -0.2 0.1 6 0.1 -0.2 0.1 0.1 0.1 0.1 0.1 0.1 -0.4 0.1 +0.2 7 +0.2 -0.2 0.1 0.1 -0.3 -0.2 +0.2 0.1 -0.3 0.1 +0.5 8 0.1 0.1 0.1 +0.2 0.1 0.1 +0.2 0.1 0.1 0.1 9 0.1 0.1 +0.2 0.1 0.1 0.1 -- 0.2 0.1 0.1 0.1 10 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 -0.2 11 0.1 0.1 +0.2 +0.2 0.1 + -0.2 -0.2 -0.4 -0.2 0.1 0.1 12 0.1 0.1 0.1 0.1 -0.3 0.1 -0.2 0.1 ... 0.1 13 +0.2 0.1 0.1 0.1 0.1 0.1 -0.4 · 0.1 0.1 0.1 0.1 14 +0.3 0.1 0.1 0.1 -0.5 0.1 -0.2 0.1 0.1 0.1 15 +0.2 0.1 0.1 +0.2 0.1 0.1 -0.3 0.1 0.1 16 0.1 0.1 +0.2 0.1 0.1 0.1 -0.2 +0.2 -0.2 -0.2

E 7

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