Microphone and preamplifier for Nomal 2B measuring unit
Microphone type 1962-9611 serial no.11055 fitted to preamplifier type CEL125 both by General Radio Co, used with Nomal 2B noise measuring unit
- Object Number:
- 1992-853 Pt1
- type:
- microphone
Nomal 2B noise measuring unit serial no.1703, marked `Dataforce' in weatherproof case, with power and battery leads and microphone mounting rod (Dataforce later became Digitronix)
Microphone type 1962-9611 serial no.11055 fitted to preamplifier type CEL125 both by General Radio Co, used with Nomal 2B noise measuring unit
Tripod and separated mounting plate for supporting Nomal 2B noise measuring unit