Paper, 'Appendix to a communication entitled "The mechanical equivalent of heat"' by Ernest Howard Griffiths

Description

Griffiths writes: 'In a communication which I had the honour of making to the Royal Society in the spring of this year, the following statement occurs (p. 420):—“We are (with the help of Mr. Callendar) now entering on a careful direct comparison of thermometer E(m) with a new form of air thermometer, which, there is every reason to believe, will give very accurate results, but we are unable to assign any definite limit to the time that this investigation may take.” A great number of comparisons have been made during the summer of this year by Mr. Callendar and myself between the mercury thermometer E(m) used by me for determining the temperature of the calorimeter, the Tonnelot thermometer, No. 11,048, described in the above paper (pp. 426—433), the platinum thermometer N, by which the mercury thermometer E(m) had been previously standardised, and two air thermometers constructed by Hicks under Mr. Callendar’s direction.'

Annotations in pencil and ink.

Subject: Physics

Received 7 December 1893. Read 11 December 1893.

A version of this paper was published in volume 55 of the Proceedings of the Royal Society as 'Appendix to a communication entitled "The mechanical equivalent of heat"'.

Reference number

PP/23/2

Earliest possible date

1893

Physical description

Ink and graphite pencil on paper

Page extent

5 pages

Format

Manuscript