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General => General Douglas Discussion => Topic started by: memaerobilia on 21 Jul 2010 at 21:34

Title: I.D early Douglas rev counter/tachometer?
Post by: memaerobilia on 21 Jul 2010 at 21:34

I am trying to find out which models and which year this Douglas 0-2400 rpm rev counter was used on. It would appear to be very early and pre-WWI. inner face (with curved oval opening at top) does not appear to have had glass. drive shaft turns. Face diameter is approx 8cm. ( 3.125 inches) Depth from front to back is approx 7 cm (less the small knob below center.

(https://www.douglasmotorcycles.net/aa-files/images/memaerobilia/2010/douglas-tach-1.jpg)

(https://www.douglasmotorcycles.net/aa-files/images/memaerobilia/2010/douglas-tach-2.jpg)

Title: Re: I.D early Douglas rev counter/tachometer?
Post by: Doug on 21 Jul 2010 at 23:38

It is from one of the WW1 era 2-3/4hp powered electrical generator sets. You also see them marked "Marconi Wireless Telegraph Company Ltd."

-Doug