Definition of Focus tube
(Phys.)
a
vacuum
tube
for
Rœntgen
rays
in
which
the
cathode
rays
are
focused
upon
the
anticathode
,
for
intensifying
the
effect
.
See also:
Focus
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Foal
Foal teeth
Foalfoot
Foam
Foam cock
foaming
foamingly
foamless
foamy
Fob
Fob chain
Focal
Focal distance of a telescope
Focal distance, or length, of a lens or mirror
Focalization
Focalize
Focillate
Focillation
Focimeter
Focus
focused
focusing
focussed
Fodder
Fodderer
Fodient
Fodientia
Foe
Foehn
Foehood
Foeman
Foetal
Foetation
Foeticide
Foetor
foetus
Fog
Fog alarm
Fog bank
Fog belt
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