You could create a plush cat at home that your child can play with and later pass down to his children. For the Coil: 4 meters solid core Cat. Really not tougher to build, but items are harder to find to make the detector. Not to depict Conventional Current !!!! The cat's whisker detector was a crude Schottky diode that allowed current to flow better in one direction than in the opposite direction. Dicho artefacto reemplazaba de manera muy elemental a los diodos detectores de cristal en las radios primitivas. The crystal is inside the metal capsule under the vertical needle "whisker" (right). The position of the cats whisker can be altered by turning the small threaded screw which in turn moves the whisker closer or further away from the crystal. This appears to be a modern reproduction of an antique cat's whisker detector used in crystal radio sets. cat's cradle cat's eye cat's feet cat's foot cat's-claw cat's-ear Catskill Mountains Catskills cat's-paw cat's-tail catsup catsup bottle Cat's-whisker detector cattail cattail family cattail millet cattalo Cattell cattie cattiness cattish cattle These sensitive galena crystals are mounted in a low melting temperature alloy. You can create unique, special toys for your child by sewing your own stuffed animals. A closeup of a the galena crystal from a cat's whisker radio detector. Tested with a resistance meter on diode setting. Title http://en.wikipedia.org/wiki/Cat's-whisker_detector Author Cefizelj Created Date 10/23/2013 11:56:03 AM Keywords () The dark sparkly crystal is galena (lead sulfide), and the copper wire touching it is the "whisker". Note: These expressions were originally American and became popular in Britain during the 1920s. Crystal and Solid Contact Rectifiers 1909 publication describes experiments to determine the means of rectification ( PDF file). Surti S1, Karp JS. Media in category "Cat's-whisker detector" The following 41 files are in this category, out of 41 total. Jagadis Chandra Bose, a professor of physics at Presidency College in Calcutta, India, demonstrated the use of galena (lead sulfide) crystals contacted by a metal point to detect millimeter electromagnetic … "The cat’s-whisker detector is a primitive point-contact diode. 1901: Semiconductor Rectifiers Patented as "Cat's Whisker" Detectors Radio pioneer Jagadis Chandra Bose patents the use of a semiconductor crystal rectifier for detecting radio waves. The leaf springs and thumbscrew allowed fine adjustment of the pressure of the needle on the crystal. On January 10, 2013 September 1, 2016 By Conscious Companion™ In Health & Well Being of Your Animal Companions 29 Comments Physics in medicine and biology.Phys Med Biol.2015 Jul 7;60(13):5343-58. doi: 10.1088/0031-9155/60/13 The crystal is a piece of the mineral galena, which you can find at many hobby shops. 6 wire (4 twisted pairs) 3" OD PVC pipe For the Cat's Whisker Detector: 1 old rust craft blade 1 HB (expierement) pencil Hook-Up wire 1 paperclip Small Piece of wood (to mount on) 3 wood screws (preferably cap but if you want to use counter sunk then you need custom metal washers too.) Silver plated "cats whisker". Another Pickard patent was the use of silicone as a detector, also patented in 1906. Solder lugs for circuit connection. The cat's whisker did the trick for Cardiff anglers Roger Martin and Dave Howells as they retained one fish and returned seven and for New Inn angler Paul Elsworthy with a matching catch; but it was a Diawl Bach pattern that tempted the seven hooked by Bonvilston fly fisherman Ted Lyons. There's a lot that goes into making a nice crystal radio set, so this is going to have to be broken down into two parts. A compact cat's whisker type crystal detector. Crystal appears to be Iron Pyrites Mounted on a slightly warped Bakelite base. Showed 430 ohms one way and 1430 ohms the other. The Cat's Meow Photographs and Fly by Ron McAlpin In the first quarter of the Twentieth Century a 'cat's whisker' was the name given to the tiny wires that connected to the detector crystal in a crystal radio set.