. Electric railway journal . ging doors. The in-terior is filled with adjustable wooden racks swungfrom overhead runways which project 4 ft. beyond thefront of the oven. When the four doors are open theseracks may be pulled from the interior and the driedsashes removed and replaced with others freshly var-nished. These racks are so supported on the oven run-ways that the vertical members may be adjusted bothlongitudinally and transversely to accommodate differ-ent sizes of sash. Ventilation is as essential to the proper finishing ofsashes and doors as car bodies, and it is provided by two12-in
. Electric railway journal . ging doors. The in-terior is filled with adjustable wooden racks swungfrom overhead runways which project 4 ft. beyond thefront of the oven. When the four doors are open theseracks may be pulled from the interior and the driedsashes removed and replaced with others freshly var-nished. These racks are so supported on the oven run-ways that the vertical members may be adjusted bothlongitudinally and transversely to accommodate differ-ent sizes of sash. Ventilation is as essential to the proper finishing ofsashes and doors as car bodies, and it is provided by two12-in. ventilators installed in the top and the perfora-tions in the floor. The ventilators are opened andclosed by dampers connected to transom lifts. The airenters the oven at the floor level and passes up throughthe electric heaters and the perforations in the baking schedule for the sash and door oven is threehours for rubbing varnish and six hours for finishingvarnish, making a total of nine hours in all for either. Electric Ry Journal Cincinnati Traction Company—Details of Oven metal or wood sashes. The oven temperature for metalsashes is 170 deg. and 130 deg. for wood. GLASS FOR SIGNAL LENSES On Friday, Feb. 20, Dr. William Churchill addressedthe New York Railroad Club on the subject of signalglass, or more properly signal lenses. He outlined theoptical principles involved in the development of signallenses from the days of the old bulls-eye lantern tothe present, when the highly efficient optical lens isstandard. At present more than a hundred designs ofsignal lenses are available, differing in focal length,size and type. There are two main classes of lens, theordinary round form with concentric rings, with cor-rugations inside or outside, and the Fresnel, withhorizontal corrugation suited more particularly for shiplights. The manufacture of glass for signal lensesrequires unusual care, as the color is very sensitive tochemical composition, and the refractive ind
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