Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

Record Details:

Title:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Date:
1906
Author:
Wright, Lewis, 1838-1905
Publisher:
London, New York, Bombay : Longmans, Green and Co.
Volume:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Leaf #:
000434
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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APPENDIX 419 for use in small halls where the latter is not available (fig. 234). The burner is cheap (about 12s. 6d.) and simple and easy to use, but the light is not as good as even the gas-burner, and hence is useless for discs above 7 to 8 feet in diameter. There is a class of incandescent spirit lamps similar to this, but in which the spirit is put under pressure, either by raising the reservoir a few inches, or by pumping air into it, with the result that the light is considerably increased; but these can hardly be FIG. 234.—Incandescent Spirit Burner recommended for amateur lanternists, as, if the temperature of the volatilising chamber should fall too low, the spirit is apt to overflow into the lantern and catch fire, and though this may seldom happen the risk is a high price to pay for the extra light, particularly as a brilliant light can now be obtained from acetylene without any danger. Acetylene Gas. —This illuminant has made immense strides during the last few years, and has now to a very large extent superseded oil lamps, and has even made great inroads upon the popularity of lime-light. A 1 Ib. tin of carbide of calcium can be obtained for about Gd., and on being mixed with water will give off