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History of the manufacturer  

Wingrove & Rogers (Polar), London

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Name: Wingrove & Rogers (Polar), London    (GB)  
Abbreviation: wingrove
Products: Model types
Summary:

Wingrove & Rogers, Ltd., Arundel Chambers, 188-189 Strand, London W.C.2.
Operating from 1920s the Company were electrical engineers and manufactured components including variable capacitors and resistors under the "Polar" Brand.
Filament Rheostats known. (Ref.: Brown Brothers Catalog 1925/26.) The manufacturing base was in Liverpool; the London offices were at 188-189 Strand.

W&R were also agents for the French connector and instrument manufacturer Jaeger.

Apart from tuning capacitors which covered a very wide range, W&R also made tuner assemblies for various radio manufacturers including Roberts Radio.
History:

From 1926 they were involved in the manufacture of battery electric vehicles having purchased the British Electric Vehicles Company. This continued until after WW2. Production of "Polar Components" continued until 1990 when the Company was acquired by Jackson Brothers.

The British Electric Vehicles division (BEV) was still running until the late 1980s. They manufactured mainly mining locomotives for non-gaseous mines with either battery operation or overhead catenary power. The main customers were in South America, typically Bolivia and Brazil. The BEV factory was in Kirkby on the outskirts of Liverpool.
The managing director was Major Charles Wingrove, the technical director was his brother Fred Wingrove, financial director was William Nichols and the sales director was Terry Dutton. The W&R factory at Domville Road had two other famous British companies as neighbours. One was the Meccano factory and the other was the Hornby train company. Old Swan was a vibrant manufacturing base on the outskirts of the city at the time. John Fielding was the Director of the subsidiary company "Polar Electronic Developments" based at the main W&R factory in Domville Road, Old Swan in Liverpool.

All of these companies have now ceased trading. The company folded in the late 1980s and the tuning capacitor division was bought by their long time competitor Jackson Brothers in London.

This manufacturer was suggested by John Koster.

Some models:
Country Year Name 1st Tube Notes
GB  25 Polar Bobbin Rheostat   Choice of 5 / 10 / 15 / 20 / 40 Ohms. 
GB  27 Polar Three   Grid-leak detector, transformer-coupled LF valve, resistance-capacity-coupled LF valve. Wa... 
GB  27 Polar Four   Grid-leak detector, three resistance-capacity-coupled LF valves. Wave range 250-5000 metre... 
GB  27 Polar Two   Grid-leak detector, transformer-coupled LF valve. Wave range 250-5000 metres. Mahogany cab... 
GB  27 Polar Twin   Grid-leak detector, transformer-coupled LF valve. Wave range 250-5000 metres. Enclosed oak... 
[rmxhdet-en]

Further details for this manufacturer by the members (rmfiorg):

Practical and Amateur Wireless 17th August 1935 Page 585tbn_gb_wingrove_rogers_anzeige_1935.jpg
  
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