Reference numberPP/10/24
Previous numbersPP/42/24
TitlePaper, 'Preliminary note on the "radio-micrometer" a new instrument for measuring the most feeble radiation' by C V [Charles Vernon] Boys
DescriptionBoys writes: 'Till lately the thermopile and galvanometer have afforded the most delicate means of detecting and measuring radiant energy. This combination has been surpassed by Professor Langley, who has made use of the increased resistance of metallic wires or the diminished resistance of a carbon filament when warmed. It seems difficult to believe, in consequence of the very small change of resistance which even iron undergoes when slightly warmed, that this is the best principle to make use of in designing the most sensitive possible instrument.'

Annotations in pencil and ink.

Subject: Scientific apparatus and instruments

Received 24 February 1887. Read 24 March 1887. Communicated by Arthur William Rucker.

A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Preliminary note on the "Radio-micrometer," a new instrument for measuring the most feeble radiation'.
Physical descriptionInk and graphite pencil on paper
Digital imagesView item on Science in the Making
Access statusOpen
Related materialDOI: 10.1098/rspl.1887.0039
Fellows associated with this archive
NA8138Boys; Sir; Charles Vernon (1855 - 1944)1855 - 1944
NA6673Rucker; Sir; Arthur William (1848 - 1915)1848 - 1915
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