"Andrew Gabriel" wrote
| "Owain" writes:
| Referring to my "Mechanical World" Electrical Year Book the output of a
lamp
| What year is this? Looks like 1920's from the lamps listed...

1934. The 'definitions and units' section includes a helpful comment that:
the standard of comparison used to-day is the International Candle (or
Bougie Decimale). A most useful little volume, although some of the circuits
remain impractical until Buy & Queue start selling Lundberg Twinob switches
:-)

Owain