Fixed crystal detector
Closed nickel plated metal housing with screw connection and built-in crystal and whisker. The whisker can be fixed permanently on a sensitive point on the crystal. Brownie introduced this system in 1925. Could be used in a Brownie crystal receiver or a a crystal receiver of another brand.
The original price was 3 shillings.
Dimensions (l x d): 5.7 x 1.2 cm
Made in: 1925
Purchased in: 2013
On the right, an advertertisement in Popular Wireless, April 9, 1925
Brownie advertisement with a number of accessoires  (including the "Note Magnifier" and the "Permatector") in the official Calalogue of The National Radio Exhibition, New Olympia Hall, London, September 4th-18th, 1926

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