Westinghouse Electric Corporation

Other

William A McAllister

Frederick James Schindler

An escape ladder at rest is an elongated cylindrical body divided lengthwise with a plurality of rung devices hingeably attached between rear quadrants and between front quadrants lockable in a horizontal position and foldable into the tubular body when left and right quadrants and mated together. Right quadrants and left quadrants are interlocked together to allow the interlocked quadrants to slideably move only lengthwise in relation to each other.

Ladder and method of using ladder for escape

A high pressure metal halide discharge lamp of the sodium-scandium type which has the maintenance thereof improved by the addition of a small quantity of lead metal powder. The lead metal powder is added to the discharge sustaining fill in an amount of from between about 0.4 and 1.2 wt. % of the total amount of discharge sustaining fill.

Metal halide lamp having lead metal powder to reduce blackening

Mercury metal-halide HID lamp has as a discharge-sustaining filling mercury, neodymium iodide and cesium iodide, with the gram mol ratio of neodymium iodide to cesium iodide being about 1:1. Sodium iodide may also be included as a discharge-sustaining material to supplement the foregoing materials. The lamp has a protective outer envelope which carries on the inner surface thereof finely divided phosphor which specifically is calcium sulfide activated by europium and sensitized by one of lead or tin, in order to lower the color temperature of the lamp and improve the color rendering properties thereof.

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Morris Township, NJ, United States of America

William A McAllister