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Marconi Newton Constant-Speed Windmill 20Y Mark III, c. 1926
Inventory Number: 54960
Date: c. 1926
Maker Details: Unknown
Inscription: "MARCONI-NEWTON 20Y MARK III / PAT NO 262558/1926" around outer ring next to central hole. "3500 RPM 1.2HP / 70/175 MPH" around inner ring next to central hole.
Size: 205 mm in radius
Materials: Aluminium.
Other Given Number(s): Christie's 149, 869 (white tag).
Notes:
Marconi Newton Constant-Speed Windmill 20Y Mark III, of aluminium construction. Blade includes enclosed centrifugal mechanism to control pitch. As used with Type AD6 set, for example 'Marconi' Universal Aircraft Telegraph Transmitter/Receiver Type AD6 D (Inv. Num. 94461).
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