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Graticule: a Scale Traced Through Wax and Etched into Glass with Hydrofluoric Acid
Scales on thermometers were made like this (Thorpe, 1912): coat the glass, trace the divisions through the coat with a fine point, and let hydrofluoric acid bite the bare lines. Acid vapour leaves the lines white and opaque, the liquid acid leaves them clear. On a small glass disc the result is a graticule for an eyepiece.
The picture: an eyepiece micrometer scale, Encyclopaedia Britannica 1911 (Wikimedia Commons, public domain).
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