ible to keep it from freezing until it reaches a chemical rays, and serves for photographing. As the by a system differing in toto from any of those at pres- temperature of 15 degrees. Under other conditions optical axes of these two objectives are parallel, every ent employed. sucha temperature… … traces of stars of the fifteenth upon which it had been laid, magnitude, thatare too faint- the electro magnetic arrange- ly indicated to show up in the ment—which was, of course, concealed within the tor- positive. Stars of the fourteenth magnitude exhibit in a single night, thus clearly…
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