Richard Harrison wrote:

Ian says he has a Bird wattmeter. Congratuletions! He has a good
instrument if it is in good shape. I expect his experience has been
satisfactory.

It has indeed, for all practical purposes.

But when we're constructing rigorous bench or thought-experiments to
prove or disprove some aspect of transmission line theory, we have to
remember that, in the very strictest sense, the Bird doesn't actually
measure power.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek