:{. 13*27,13*28 and 13*29, contain illustrated articles on thissubject by G. Marconi. Additional illustrated articlesby other authors are contained in Scientific Ameri-can Supplement Nos. 11*24. 1131, 1177, 1102,1*217, 1*218, 1819 and 1304. These papers con-stitute a valuable treatise on wirelesB… … Microscope for Projection. NEWIMPROVED New metaltrack platewith keysto unlockg t andardand changeinstantly —combi ningalso polari-ecope andstamoscope.New seriesof projec-tion objec-tives with flat field, well lighted and clear definition. New sub- statre condenser on a new system. Illustrated…
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