General catalogue of the manufactures of Adam Hilger, Ltd (1928)
Hilger, Adam · London EN · leaf 60
n the metric system if desired. «< 1 Standard " Spherometer (Ring Form). Fig. L 3. This form of spherometer has a ring instead of the usual three legs. The ring is optically ground so as to have two truly circular edges, one of which makes contact with concave surfaces, and the other with convex… … Heliostat for use with Table S; eters, see Fig. L 4; which shows the at in position before a Wavelei ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
Spectrometer
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
