This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ... The wick is a matter of considerable importance in such a lamp, the illuminating power varying to a marked degree according as a fine, medium, or coarse wick is used. The standard wick is one of medium mesh, and consists of 75 threads, and weighs 3.6 grammes a decimetre length. It is essential that perfectly dry wicks ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ... The wick is a matter of considerable importance in such a lamp, the illuminating power varying to a marked degree according as a fine, medium, or coarse wick is used. The standard wick is one of medium mesh, and consists of 75 threads, and weighs 3.6 grammes a decimetre length. It is essential that perfectly dry wicks be used, and they are commonly kept in a case containing an absorbent of moisture. Fio. 37. 130. The flame height is not specified for this standard, for its unit working flame is determined only by the weight of combustible consumed, the dimensions of the chimney, and the height of the wick above the tube. 131. A glass chimney of the ordinary argand shape encloses the flame. The thickness of the glass is specified at two milli Audojn and Bvard; ref, cit, attached, extending upward beyond the top of the chimney, and placed 1.5 inches distant from the axis of the flame. An opening is left in this screen opposite the centre of the flame; and this is covered with a thin slide containing two rectangular openings, whose longer axes are placed vertically. Each of these apertures is of standard dimensions, adjusted to pass a light flux of two English candles' intensity, with a flame height of three inches for the smaller one and 2.5 inches for the larger. The slide is bevelled to a sharp edge at the openings; a condition required in all light diaphragms. In order that the area of the standard aperture shall not change by corrosion, it is cut in a sheet of silver. All the metallic parts of the standard are given a dull black finish. Two apertures are usually provided in the same slide: the one for plain gas, and the other for carburetted. The first aperture is 0.233 inch wide and one inch long; and the second one is 0.31 inch wide and 0.585 inch long...
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Add this copy of Photometrical Measurements and Manual for the General to cart. $50.75, new condition, Sold by Media Smart rated 4.0 out of 5 stars, ships from Hawthorne, CA, UNITED STATES, published 2007 by Kessinger Publishing.
Add this copy of Photometrical Measurements and Manual for the General to cart. $52.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2007 by Kessinger Publishing.
Add this copy of Photometrical Measurements And Manual For The General to cart. $54.15, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2007 by Kessinger Publishing.
Add this copy of Photometrical Measurements and Manual for the General to cart. $54.95, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Kessinger Publishing.
Add this copy of Photometrical Measurements And Manual For The General to cart. $56.39, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2010 by Kessinger Publishing.
Add this copy of Photometrical Measurements and Manual for the General to cart. $59.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2016 by Palala Press.
Add this copy of Photometrical Measurements and Manual for the General to cart. $59.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2015 by Palala Press.
All Editions of Photometrical Measurements and Manual for the General Practice of Photometry: With Especial Reference to the Photometry of ARC and Incandescent Lamps
