Observations

chronometer

Letter by H C Russell, 6 March 1891

March 6, 2009

Pages 160-161 March 6 1 My Dear Sir I have just received yours of 5th instant with vouchers and chronograph tape. I fear you have made a serious mistake in adapting the chronometer time. The chronometer is only intended for use when you do not get clock ticks: The ticks when received are necessary for the clock to make a break 4 seconds ....ng.

Letter by H C Russell, 26 October 1870

October 26, 2008

172 Sydney Observatory 1870 26 October 1870 My dear Adams We estimate the weight of Standard Bar and moving part of platform as between 4 & 5 cwt. The Tower part of platform is cemented to the floor and it would be a pity to take it up if I am to ??