Proprietors and Foremen. SCIENCE IN TOYS. Fig. 2.–DIAPHRAGM AND FINE ADJUSTMENT. Fig. SSUBSTITUTE FOR REVOLVING TABLE. Fig. 1THE TOY MICROSCOPE., scientific american, 1887-04-16
Proprietors and Foremen. SCIENCE IN TOYS. Fig. 2.–DIAPHRAGM AND FINE ADJUSTMENT. Fig. SSUBSTITUTE FOR REVOLVING TABLE. Fig. 1THE TOY MICROSCOPE., scientific american, 1887-04-16
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