That I even know their identity is owed
to the precious data sent to me by site contributor Sanders Saltzman,
also a Queens resident although not related to me. Sanders supplied
me with a copy of a Unidor catalog. They were manufactured by
McGraw Edison and were boosted as being a snap to maintain, due
to their detachable power deck. Their design was touted as "simple"
and their expression certainly made them look simple. The 400
shown here uses, of course, 400w lamps. A smaller brother model,
the 250, used 100-250w lamps, but I never saw them used here.
I suspect most of the 400s use the same refractor bowl as do
the TB327s. In any event, the Unidor's spec sheet says it could
be supplied with either a prismatic borosilicate glass, or polycarbonate
Today, the Unidor 400 is definitely an endangered species here.