| Show material needed to make compact rheostat the materials needed jo to make this rheostat are a composition dial some resistance wire a small strip ot of brass and some borne screws and mica disk clink wind the resistance wire on a 3 10 inch rod when the coll coil Is wound on oil connect oue one end to the brass backing in side fide of the dial and cut the oth other erlend end off about M 14 inch from the setscrew set screw that runs from the top or of the dial to the bushing cut out a round piece of 01 thick mice large enough so ao that the wire will fit at tightly on it and then groove the rules mica cut out a hole in the center of the disk so it will fit snugly over the bushing and drill a hole the size sire of tills setscrew set screw parallel with the disk put the setscrew set screw in and this will hold the disk on the dial punch two holes in the disk where the two ends come and conict one end to the bushing this serves as one contact and the other contact la Is made by the small brass strip that Is fixed on thoi tho pauel panel |
