A press to test warning lamp is a recent addition to the range of electrical equipment produced by Dowty Nucleonics’ Aircraft Electrics Division at Tewkesbury, Glos.
Stated to be equally suitable for industrial or aircraft use, it incorporates facilities for dimming and for lamp-filament checking. Interchangeable with earlier approved types of warning lamps and electro-magnetic indicators, the unit (which is of 11/16” overall diameter) can be installed from the front of the panel.
When the device is used as a “normally off” warning indicator the lamp filament can be checked by simply pressing the transparent plastic pens, so lighting the lamp through auxiliary contacts. Bulbs, quickly replaceable, are available for 6, 12 or 28V working.
The lamp is available either with or without variable dimming to suit the ambient light and the adjustment is made by rotating the lens bezel through 90°. Red, green, amber, blue and clear lenses are available.