Lot Essay
A note with the Billi condenser descibes it as 'Probably made about 1912 by the Marconi Wireless Telegraph Company'.
Details
Miscellaneous radio equipment:
a Revophone crystal set, in re-varnished case; a Billi condenser, with rack-and-pinion control to outer cylinder, on ebonite base -- 6in. (16cm.) wide; a Gambrell resistance box, with ebonite panel on mahogany base; and a unidyne receiver, constructed in 1993 from old components, incorporating a Thorpe K4 valve, a condenser and a Burndept swinging coil, on mahogany base (4)
a Revophone crystal set, in re-varnished case; a Billi condenser, with rack-and-pinion control to outer cylinder, on ebonite base -- 6in. (16cm.) wide; a Gambrell resistance box, with ebonite panel on mahogany base; and a unidyne receiver, constructed in 1993 from old components, incorporating a Thorpe K4 valve, a condenser and a Burndept swinging coil, on mahogany base (4)