London had suffered 57 days of non-stop bombing from the Luftwaffe in 1940 – it was relentless. There must have been many bombs that failed to explode, so there must have been a ready made market for such a device.
This advert for an Incendiary Bomb Detector appeared in the local Bromley Times newspaper in July 1941.
Incendiary Bomb Detector
Incendiary Bombs can be rendered non-effective
If they are Dealt with Promptly
This can be done if you install a detector.
Many Installations completed – automatic – inexpensive
Apply for particulars to:-
The Borough of Bromley Electricity Dept.
1 West Street, Bromley, Kent
Bromley & District Times, 11th July 1941 (page 4)