Projection Apparatus (1917)

Record Details:

Title:
Projection Apparatus
Date:
1917
Publisher:
Rochester, N.Y: Bausch & Lomb Optical Co.
Volume:
Bausch & Lomb Optical Co. Projection Apparatus
Leaf #:
00035
Language:
English
Collection:
Magic Lantern and Lantern Slide Catalog
Format:
Catalogs
Contributor:
Toverlantaarnmuseum Scheveningen (TOMU)
Sponsor:
A Million Pictures
Coordinator:
Media History Digital Library
Description:
This catalogue advertises various projection devices, for projection of transparent images and for the projection of opaque objects as well as film projectors. The technical workings of each apparatus are explained. The catalogue also lists projection lenses and light sources (electric light, carbon light, oxyhydrogen light), fuses, light bulbs, switches and microscopes for projection. The catalogue is richly illustrated.
Date Added:
March 28, 2024
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Bausch & Lomb Optical Company Attachments While the Model C Balopticon is primarily a lantern for slide projection, it can nevertheless be fitted with attachments for the projection of opaque objects, microscopical specimens or large transparent objects held in a horizontal plane. Attachment for Opaque Objects Figure 5—Model C Attachment for Opaque Objects. The attachment for the projection of opaque objects, such as photographs, illustrations from text books, post cards, etc., Figure 5, can be very easily attached to the lamp house portion of the Model C Balopticon by means of the sliding ways on the front of the slide carrier support which regularly carries the rear end of the bellows. The front standard and rods are easily removed. If the apparatus is to be used at a comparatively short distance from the screen, the 12- inch focus lens of 2%6-inch diameter can be satisfactorily used, but for distances of 20 feet or more from the screen we recommend the use of the 4-inch diameter, 15 or 18-inch focus lens, since the illumination is increased according to the square of the diameter of the lens. The use of the attachment is recommended only when the apparatus can be placed at a comparatively short distance from the screen (25 feet) in a well darkened room and with an arc lamp operating on at least 25 amperes of current. 32