A NEW CRYSTAL DETECTOR

Radio Record, Volume I, Issue 20, 2 December 1927, Page 15

A NEW CRYSTAL DETECTOR

"HAS SEVENTY CONTACTS. A new type of what is claimed to be a trouble proof crystal detector has made its appearance. The new crystal detector is practically permanent, each crystal being . chemfeally treated by an exclusive and secret jaboratory process, which guarantees its life indefinitely. Adjustable springy tension maintains and insures even and constant contact at all times. A single wire or catwhisker cannot transmit the necessary electrical energy through it, without destroying the contact point or the crystal face. To remedy this condition, use has been made of a silk core brush, composed of seventy strands, which distributes the energy equally, thus making it impossihle to burn out either the erystal or contact poiuits.

The silk brush used is constrneted of seventy silk cords, minutely wrapped with flat bronze tinsel, making contact on the full crystal face, preventing burning out of crystal and resulting in louder music. ‘This detector is easily fitied to your panel, by drilling one 7-16 ineh hole.