N.P.L. Horizontal projection machine
N.P.L. Horizontal projection machine, without stand or screen; dated 1916 ( a sliding plate and vertical adjustment component is missing).
N.P.L. Horizontal projection machine, without stand or screen; dated 1916
N.P.L. Horizontal projection machine, without stand or screen; dated 1916 ( a sliding plate and vertical adjustment component is missing).
Carbon arc lamp for use with the N.P.L. horizontal projector.
Transformer for carbon arc lamp
Holder for gauges for use with a horizontal projector.