Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 161
a largerGlasses. image is formed in the eye it is inverted, or upside down, so that this kind of a tele-scope is of no use as a glass to spy things with en the surfaceof the Earth. How to Make a Cheap Telescope—rLenses are absurdlycheap. If you live in a large city you will find lens grinderswho… … £ , : 6~ 5% try
Astronomy · Stars
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