Three unsigned sheets of summary and explanation, 1882.

Letter from G. Symons to W.H.M. Christie explaining the layout of the thermometers, 1883.

Letter from W. Ellis in reply to the above, 1883.

Letter from G. Symons to W. Ellis giving further explanation and details of observational methods, 1883.

Letter from G. Symons to W. Ellis regarding forms of report, 1883.

Blank observation form [1883].

Letter to G. Symons from W. Ellis thanking him for the information, 1883.

Undated summary sheet for 1873-1882.

Report by W. Ellis on a visit to view the thermometers at Deptford, 1883.

Letter to G. Symons regarding discrepancies in the readings, 1883.

Letter from G. Symons answering points raised in the previous letter, 1883.

Letter from W. Ellis to Symons, 1883.

Letter from W. Sowerby-Wallis to W. Ellis confirming that the 'reading' indication had been omitted, 1883.

Letter from W. Ellis to G. Symons regarding the incorrect recording of readings, 1883.

Letter from W. Sowerby-Wallis to W. Ellis regarding incorrect readings, 1883.

Letter from W. Ellis to W. Sowerby-Wallis enclosing requested records, 1883.

Summary table of thermometer readings, 1883.

Letter from W. Sowerby-Wallis to W. Ellis regarding damage done to the Thames thermometers, 1883.

Letter from W. Ellis to G. Symons regarding the renewal of the thermometers, 1884.

Letter from G. Symons stating that the [London] Sanitary Authority is to renew the thermometers, 1884.

Letter from W. Ellis to the Chairman of the [London] Sanitary Authority regarding the renewal of the thermometers, 1884.

Papers relating to reductions of observations by Sir George Airy.

Letter from G.B. Airy offering to undertake reductions, 1881.

Letter to G.B. Airy enclosing abstracts of thermometer readings, 1881.

Two undated blank reduction forms [1881].

Two completed reduction sheets covering May/November 1869 [1881].