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.

TROUBLES WITH THE MAGIC LANTERN [CH. I § 60. Centering the vertical objective. — After the horizontally placed condenser lens is centered the objective is placed in a vertical position over it and moved sidewise until the cone of light enters the middle of the first face and leaves the middle of the last face of the objective. One proceeds exactly as for centering it in the horizontal position (§ 55, 58). Just over the objective is placed a 45 degree mirror silvered on the face, or a right-angled prism, to direct the vertical rays horizontally to the screen (fig. 16). The lower mirror may be an ordinary glass mirror silvered on the back, but the mirror over the objective must be silvered on the face to avoid a duplication of the image. TROUBLES: HOW TO AVOID AND HOW TO OVERCOME THEM THE LAMP CANNOT BE STARTED § 61. This may be because there is no voltage in the main line. The presence of current is easily determined by using the testing incandescent lamp (fig. 21). An incandescent lamp in the circuit as shown in fig. 2 or 4 will show whether the current extends to the lamp switch. FIG. 21. TESTING INCANDESCENT LAMP. Wl W? The two supply wires for the lamp. For this testing lamp a socket without key switch is best. It is also wise to have the lamp protected by a wire guard. The wires at W-, W2 should be exposed only a short distance as shown. To test with the lamp put the naked ends of the wires Wt W., upon metallic parts of the circuit to lie tested being sure to make contact with both conductors of the circuit. For example, the two wires or the two blades of a knife switch, etc. If there is voltage in the line at that point the lamp will light up. § 62. The connections in the arc lamp may not be good, that is, the set screws holding the connecting wires may have become