Sky & Telescope

Sky & Telescope

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SCHOTT NARROW-BAND INTERFERENCE FILTERS 300 to 2, 000 rmi. ... Since only a small segment of 90Ad rotation is actually used, the vernier drive of an old radioa#39;s variable capacitor was added to achieve fine control ... Mr. Hereforda#39;s design is shown in the diagram and photographs. ... appear in focus, or reasonably so, when viewed against the sky. ... to reduce scattered light- The spot support can be made of blackened wires instead of the post showrn in the pictures, although weanbsp;...

Title:Sky & Telescope
Author:Charles Anthony Federer
Publisher: - 1962


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