A Pyrheliometer.

Illustration depicting a Pyrheliometer, an instrument for the measurement of direct beam solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. Dated 19th century. (Photo by: Universal History Archive/Universal Images Group via Getty Images)
Illustration depicting a Pyrheliometer, an instrument for the measurement of direct beam solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. Dated 19th century. (Photo by: Universal History Archive/Universal Images Group via Getty Images)
A Pyrheliometer.
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Credit:
Editorial #:
921869416
Collection:
Universal Images Group
Date created:
January 01, 1850
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License type:
Release info:
Not released. More information
Source:
Universal Images Group Editorial
Object name:
917_05_WHA_106_0166
Max file size:
4189 x 5006 px (13.96 x 16.69 in) - 300 dpi - 6 MB