Paper, 'On the measurement of the relative thermal intensity of the Sun, and on a self-registering instrument for this purpose' by E [Edward] Frankland

Description

Frankland writes: 'The thermometric estimation of relative solar intensity, according to the best known means, requires first the determination of the temperature of the air—so-called shade temperature—and secondly, and simultaneously, that of a thermometer with a blackened bulb placed in vacuo in the sunshine—Sun temperature: the difference between the two temperatures being taken as a measure of the Sun’s radiant heat operating at the time and place of the two observations. The chief sources of error in this method are the difficulty of ascertaining the temperature of the air immediately surrounding the vacuous globe containing the blackened bulb, and the placing of this thermometer under exactly similar conditions at different meteorological stations.'

Annotations in pencil and ink.

Subject: Thermodynamics

Received 24 January 1882. Read 2 February 1882.

A version of this paper was published in volume 33 of the Proceedings of the Royal Society as 'On measuring the relative thermal intensity of the Sun, and on a self-registering instrument for that purpose'.

Reference number

PP/1/27

Earliest possible date

1882

Physical description

Ink and graphite pencil on paper

Page extent

15 pages

Format

Manuscript