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Show Snap Fasteners Are Aid to Experimenter The small snap fasteners for dresses that are sold in five and ten-cent stores for five cents a dozen may be put to a great many uses by the radio experimenter. experi-menter. The accompanying sketches show a few of the uses to which they can be adapted. These fasteners make very neat binding posts and by using different dif-ferent sizes and different halves of the fasteners ths set can be made so that It Is Impossible to connect it up wrong. By soldering one-half of the fastener on the phone cord and the other half on the panel with a common pin as shown, the phones can be plugged In quickly and if the cord gets a strong pull they will release and not pull the set off the table. A very good multipoint multi-point switch can be made by pinning to the panel as many points as wanted In a circle and also one at the center of the circle, and then with the two halves of the fastener soldered onto a strip of copper at a distance equal to the radius of the circle a switch arm can be made. The fastener In the center cen-ter makes a good swivel and when tlve right point of the switch Is found in tuning the other fastener can be '"kl V-J w'' ' pushed home, making almost a positive posi-tive contact Another use made of the fasteners is In mounting home-made honeycomb or spider-web colls. Fasten one part of the fastener on both top and bottom of the coll form and solder the ends of the coll to them. The other half Is soldered to a strip of copper or brass that acts as the arm to swing them on. This form of mounting Is very handy If much changing of the coils Is made for It works so quickly. A good connection con-nection to the end of the variocoupler or variometer rotor shaft may be made by Boldering a fastener on the end and the other half to a flexible wire. No doubt other uses will occur to the experimenter. They are cheap and make a good contact and provide a neat appearance. |