Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 119
116 GILBERT BOY ENGINEERING … Fig. 174. You make a telescope into the first and your telescope ismade (Fig. 174). Focus it on adistant object. The Compound Microscope(Fig. 175) is the same in principleas the astronomical telescope, butthe objective has very great power,that is, it has a very short focallength. The objective…
Light · Scientific recreations
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