Valve Receivers 
 
The 1910 Marconi (UK) catalogue index describes four variations of the Valve Reveiver.

Valve Receiver No. 1 (Short Wave) - 250 to 759 metres
Valve Receiver No. 2 (Short Wave with intermediae circuit) - 600 to 1200 metres.
Valve Receiver No. 1 (Long Waves) -  1600 to 4200 metres
Valve Receiver No. 2 (Long Wave)  -  Custom order

When ordering from the atalogue, reference number 1051R  covered 250 to 750 metres while reference  1052R covers 600 to 1600 metres.

Dimensions: 19.25" x 13.25" x 10.375"
Weight: 27.5 pounds
Power input: 6 VDC

valve_receiver_105x.jpg
Valve Receiver. The 1051R and 1052R are not model numbers. They are only catalogue reference numbers. (Image courtesy Marconi UK.) 
Contributors and Credits:

1) Jacques Hamel <hamja(at)videotron.ca>
2) Marconi (UK) Radio catalogue. 1910.

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Jun 15/18