the Gilseal 300 heat lamp was fitted with a metal tubular
Gilseal 300 heat lamp
Metal tubulars consisted of a coiled nickel-chromium
wire in an electrical isolating binder of for instance
magnesium-oxide or aluminium powder, mounted in
a sealed tube of brass or stainless steel. Compared
with quartz tubes, metal tubular radiators had an
even greater output in the far infrared areas and
less in the more desirable near infrared areas
(approximately 15% IR-A, 40% IR-B and 45% IR-C)
making them more suitable for heating applications
which of course could have a therapeutic value too.
At least the Gilseal 300 heat lamp on display here,
was fitted with a metal tubular and sold as a
therapeutic infrared radiator in Australia.