Originally Posted by
India Four Two
I would like to know what TEL means?
I think it's instruments made by Haslar Telegraph Works, 26 Victoria Street, London. A PhD thesis
The History and Development of Aircraft Instruments - 1909 to 1919 John Kirkham Bradley Imperial College 1994
mentions their instruments and if you google Haslar you'll get a lot more detail eg
https://www.aviationancestry.co.uk/?...9&endYear=1990