Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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CH. IX] THE PROJECTION MICROSCOPE 223 Micro-projection is simply a refinement of ordinary magic lantern projection. If one understands the principles, and has mechanical skill to apply them, there is no great difficulty in microprojection. But if ordinary magic lantern projection is unsatisfactory7 in untrained hands, micro-projection in such hands is intolerable. This is, however, such a powerful aid to the teacher and the lecturer that the time necessary to learn to use it properly is not to be counted. With micro-projection the beauties of structure and Condenser H C FIG. 122. MAGIC LANTERN FOR COMPARISON WITH THE PROJECTION MICROSCOPE (See fig. 2). form are made visible to an entire audience with all their color, delicacy and exquisite perfection. Furthermore, the teacher or lecturer can indicate on the screen the special points to be noted, and feel confident that his auditors see the special features and do not get confused by the mass of details, as when looking into a microscope. Often too, the most interesting and important structures in a specimen are not so striking as some less important detail, and the important points are likely to be missed unless pointed out. § 353. Limitation of the Projection Microscope. — Perfect and useful as the projection microscope is, it is limited in its powers. One can show with full satisfaction to a large audience (200 to 1000) only those details which an experienced observer can see by