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Lightbulbs in Stand
These light bulbs were manufactured around 1905. They can be dated by the construction of the filament. To learn more about antique light bulbs,…
Jamin's Divided Circle
This apparatus is listed in the 1885 catalogue of Jules Duboscq of Paris as the “Grand Circle of MM. Jamin et Sénnarmont.” It was designed for the study of the laws of polarized light reflected from crystalline substances, from liquids and from…
Glass Presses
Glass, when stressed, shows the property of double refraction: light of differing polarization directions bends differently passing through the glass. When placed between crossed polarizers , bands of color may be seen, with the spacing of the bands…