Crystaloi Detector Type AA with Buzzer coupling

The Eugene T. Turney Co. Crystaloi Type AA crystal detector.

From The Electrical Experimenter - January 1917: The Crystaloi Detector is a very novel instrument and comparatively young as detectors go. The detector does not require a battery and has a sensitivity on par with the average run of mineral detectors. It comprises a hollow drum, or rather disk, as shown in the illustration. This is supported between two vertical spring clips so that the drum may be rotated on its axis until the maximum sensitivity is attained. Practically all mineral detectors and also the Crystaloi are adjusted to maximum sensitivity by a "buzzer test." An ordinary buzzer and battery, together with a key or push button, completes this important piece of apparatus, and a single wire from the contact screw in front of the buzzer armature is connected to the detector circuit (couplingl, middle terminal) or aerial circuit

The Crystaloi detector has two metal discs or plugs inserted in either side of the hard rubber revoluble drum, one of which contains a small piece of sensitive mineral. The space between the two metal disks is partially filled with a special mixture of certain light metallic filings. When adjusting this detector, the revoluble drum is moved a little at a time until the metal filings take up their proper position, making contact between the plain metal disk on one side and the sensitive mineral on the other. This action is quickly brought to a maximum by the application of the buzzer test current thru an inductance of several turns of' wire. A pair of high resistance 'phones should be used with this detector. Contrary to other mineral detectors, where only one "catwhisker" contact wire is used, the Crystaloi uses the many contacting points of the filings.

see also Connecticut
see also Clapp-Eastham 

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