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)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

CH. I] vSOME AMERICAN MAGIC LANTERNS 61 PIG. 35. SECTIONAL VIEW OF AN ARC LAMP AND A TRIPLE-LENS CONDENSER WITH WATER-CELL. + W Wire going to the positive carbon. W Wire from the negative carbon. He Horizontal or upper carbon ; it is positive. Vc Vertical or lower carbon ; it is negative. L The crater of the positive carbon ; it is the source of light. Cond I The first element of the triple-lens condenser. The meniscus is always placed with the concavity next the source of light. Cond 2 The second element of the triple-lens condenser. It is a planoconvex lens and should be of the same focus as the projection objective. The different lenses should be in the position shown in this diagram. Between the two convex lenses in the parallel beam of light is placed the water-cell. BI B3 Blocks supporting the arc lamp and the condenser. Base The base-board with the track along which the different parts move (see fig. 40). Axis The principal optic axis of the condenser and continuous with that of the projection objective. FIG. 36 A. MAGIC LANTERN WITH AN AUTOMATIC LAMP AND INCLINED CARBONS. (Cut loaned by P. Keller & Co., successors to the J. B. Coll Co.). This lantern is very widely used. It has a two-lens condenser (see fig. i). Its main defect is that every part, lamp, condenser lantern-slide holder and objective can be separately raised or lowered.