Washington County News | 1924-10-09 | Page 7 | Crystal Detector that Requires No Adjustment

Crystal Detector That Requires Re-quires No Adjustment. A dependable crystal detector requiring requir-ing no adjustment can be assembled from the following materials: Two upholstery or thumb tacks, two binding posts, two pieces of bakelite or other good insulating material, a length of hard drawn copper wire for clips and a small piece of crystal. Any good crystal will do, but perhaps best results re-sults will be obtained If the crystal is of the synthetic "all-sensitive" variety. One piece of bakelite should be at least 1M inches long and about of an Inch square. This piece Is drilled lengthwise through the center with a small drill of a size to snugly accommodate accom-modate the two thumb tacks. One tack is Inserted In this hole to within Cartridge pjxj' Cross section of cartridge Form of Fixed Crystal Detector Adaptable Adapt-able to Reflex Receivers. about 3-10 of an inch of the center. The crystal should now be pounded to fine grains and of an Inch of them poured into the hole from the opposite end. The second tack should now be Inserted in this end so that the crystal crys-tal grains make contact between the points of both tacks. A mounting for this crystal detector may easily be made from the copper wire and may take the form shown, in the diagram. This type of detector will prove both sensitive and stable and may be used successfully In a reilex circuit Radio News.