The Incandescent Gas Light; Its History, Character and Operation. Comp. for the Inventor, the Manufacturer and the Consumer (Paperback)

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. 1896 Excerpt: ...space, but may also be led in part through the hollow corner-pieces into the lower chamber of the casing, should also be mentioned here. A condition of the close lantern which is not found in lanterns provided with doors in the side, is the necessity of arranging some device for ignition from the outside, a subject which has already been taken up. Similar constructions have been devised, which provide for the case in which the burner-cock is placed closely beneath the burner and thus remains inside the lantern while opening and closing must be performed from the outside. A solution of the problem necessitated in consequence has been discovered, for instance, by Vole"8, who provides the cock-key and a revolvable collar on the gas-pipe beneath the lantern with corresponding segments of wheels, which are connected in duplicate with one another by means of little chains, or the like, so that the rotation of the collar accomplishes a similar rotation of the cock-key. The segments provide for an exact movement of the chains in straight lines through the base of the lantern, whereby only small openings in the latter are necessary. Fig. 68. Biedinger's Lantern For Incandescent Lights. While indoors the radiation of light toward the sides and upwards is not lost in illumination, but is more or less returned, according to the reflective capacity of the walls and ceilings, in the case of the street-lantern the loss of the light-rays not directed downward can never be regained. A reflector, therefore, cannot be avoided in this case; its purpose is to catch rays not striking directly beneath the lantern and to return them thither. A flat cone, the lower base of which is placed about 5 mm. (J inch) above the source of light, has proven to be apparently the best form...