Focus tube

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
-Focus tube-
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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