The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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VI P li £ F ACE. PREFACE TO SIXTH EDITION. MARCY'S SCIOPTICON is now no new thing. It has taken its place as a standard projecting Lantern, and is accepted as a great advance in this direction. As it becomes better known, and less in need of explanations, the Sciopticon Manual might be contracted rather than enlarged, only that something more may be said to advantage of its new attachments and new uses. It will ba seen that the Triple Jet, the Gas Sciopticon, the Gas Microscope, etc., have been improved since the illustrations prepared for the Fifth Edition were drawn. The Automatic Cut-off is yet new to many, who will stand in need of a fuller explanation in print. The description and illustrations of the Franklin Insti- tute Gas Holders will interest Managers of Educational Institutions. It is believed that all who are alive to the advantages of photographic projections will find the Sciopticon Manual a valuable Hand-book.