VOLUME 14             MAY 1997                NUMBER  5

DeForest Detectors RJ4 and RJ5
From DeForest Bulletin B14

(See printed version of A.R.C. for complete 6-page article)

THE deFOREST AUDION DETECTOR
IMPROVED TYPE RJ4

Licensed for Private Use Only

This instrument represents the highest development of wireless detecting apparatus known to science.

Tests conducted by the United States Bureau of Standards have shown it to be fully 50 per cent. more sensitive than any other form of detector (Bulletin, Bureau of Standards, Vol. 6, No. 4, P. 540).

Its adjustment is instantaneous, and is unaffected by mechanical or electrical disturbances.

This instrument is complete in itself, the only necessary connections being to the secondary terminals of the tuner, to the phones, and to a four volt battery. All these connections are plainly marked on the cabinet.

Throwing on the switch at the right of the Audion bulb to the left or right lights one or the other of the filaments. The battery switch at the left of the lamp and the rheostat lever are then moved to a position where signals are at their best. After these adjustments are once made, the throwing off of the switch instantly places the detector out of service. Do not keep the Audion bulb lighted when not using the instrument.

These detectors are thoroughly tested before shipment, and are guaranteed to leave our factory in perfect working order.

Price for the instrument complete as illustrated, $18.00.

THE deFOREST AUDION DETECTOR
TYPE RJ5

Licensed for Private Use Only

This instrument is complete in itself, the only necessary connections being to the secondary terminals of the tuner, to the phones, and to a four volt battery. All these connections are plainly marked on the cabinet.

Throwing on the two point switch at the right of the Audion bulb lights one of the filaments. The battery switch at the left of the lamp and rheostat lever are then moved to a position where signals are at their best. After these adjustments are once made, the throwing on or off of the two point switch instantly places the detector in or out of service. After the first filament has been consumed, wind the little copper wire tight around the brass base of the bulb underneath the rubber band. This connects the second filament.

These detectors are thoroughly tested before shipment, and are guaranteed to leave our factory in perfect working order.

Price for the instrument complete as illustrated, $25.00