Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 162
Fig 154. — Paste-board Lens Mount-ing. OUTSIDE PASTEBOARD _*TUBE MOUNTING INSIDE TUBE … Fig. 155.—Opera Glass Telescope. Cross Section. heavy pasteboard by slicing out a very thin strip with the pointof a sharp knife, being careful not to cut through the thin card-board. Now bend the strips around the lens with the lens inihe groove, glue over the thin end as shown in Pig. 154, and…
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