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Frequency Range:  ?
Primarily, it uses a carborundum detector and a Weston galvanometet to locate a particular wavelength.
Nameplate information:

'MARCONI' WAVEMETER / INST NO 310734 P.S. NO ________ / TYPE M.C.2 / MARCONI'S WIRELESS TELEGRAPH CO. LTD. LONDON" printed on metal plaque upon upper surface.
 

MC-2 wavemeter - front view.

MC-2 wavemeter - rear viewfront view.

Both images courtesy History and Science Museum,, London. Click on image to enlarge.

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Contributors and Credits:

1 )http://www.mhs.ox.ac.uk/collections/imu-search-page/record-details/?TitInventoryNo=38737&querytype=field&thumbnails=on
 
 

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Feb 17/20