Gte Sylvania Incorporated

Thomas B McDonough

John W Shaffer

Donald E Armstrong

Ronald E Sindlinger

Edward D Parent

William J Harvey

An electrically conductive boat for the vacuum evaporation of metals comprises a refractory composition consisting essentially of a conductor of titanium diboride and/or zirconium diboride, a coconductor of silicon carbide and an insulator of boron nitride.

Electrically conductive boat for vacuum evaporation of metals

A photoflash unit having a flashed lamp indicator comprising two layers of film having different colors, one of the layers being a heat-shrinkable material and the other layer being translucent and substantially unaffected by the heat of lamp flashing. An adjacent indicia sheet provides an aperture through which one of the indicator colors is visible. Upon flashing of an associated lamp, the heat shrinkable layer shrivels from view and the color of the other layer becomes visible through the aperture to clearly identify which lamp was flashed. In one embodiment, the two-color indicator is used to identify the last lamp flashed in a sequence, while each of the preceding lamps in the sequence has a respectively associated single-layer color indicator which shrinks away to leave a void upon flashing of the lamp.

Photoflash unit with two-color indicator

A photoflash lamp containing a readily ignitable, hydrogen-containing substance, such as shredded paper or a spot of sucrose, to controllably induce bursting of the lamp upon ignition for purposes of testing the relative strength and reliability of lamp containment systems, including the envelope, envelope coatings and flash unit enclosures.

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San Jose, CA, United States of America

Thomas B McDonough