In the case of a reflecting telescope of large angular four long rigid arcs of cast-iron are used to give greater across the Potomac to the mansion house at Arlington, aperture, such as the present instrument, great rigidity stability of position laterally; two of these are bolted of the tube and… … ilar structures. The connection in addition to this the observer TWO-FOOT REFLECTOR WITH WHICH PROF. RITCHEY PHOTOGRAPHED THE NEBULA between the Mall system and the watches and "guides" through- SURROUNDING NOVA PERSEI. HIS ASSISTANT, MR. PEASE, WORKING THE DOUBLE- Capitol is formed by a rectangle…
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