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Philips Infraphil 7525/72 heat lamp
bayonet mount (en.wikipedia.org)
bayonet socket
lamp base
THE-WHITE-INFRAPHIL-LAMP
The first Infraphil heat lamps from 1946 were made
of blown glass and the base of these lamps was
connected to the socket in the armature by means
of a so-called bayonet mount. Two electrical
contacts were located at the bottom of an isolator
that fitted into the metal base of the lamp. There
were three pins that sideways protruded the metal
base at an unequal mutual distance, causing the
base of the lamp to fit in the socket in one position
only. The pins fitted into three corresponding
sleeves in the socket. The lamp was gently pressed
against a spring-loaded construction in the socket
and is than hooked into it by a slight turn of the lamp.
The early "white" Infraphil heat lamps can easily be
confused with blended lamps that have been
merchandised in the same era and partly even in the
same type of armatures. Blended lamps however,
are no heat lamps but ultraviolet- or
sunlamps.
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