A comparison of stellar radiometers and radiometric measurements on 110 stars
A 1915 technical report by W. W. Coblentz for the National Bureau of Standards, comparing stellar radiometers and tabulating radiometric readings for 110 stars, written for astronomers and instrument makers. The figures are line diagrams of thermocouple and radiometer elements — circular vignettes enclosing labelled bismuth-platinum junctions, coiled copper leads, and lettered terminals — usable as small circular schematic motifs and technical lettering.
