. Dental electro-therapeutics. zinc unconnected, to eachof these attach a wire two yards long but let the first wirebe blue and the last be red to distinguish them. The wirefrom the first carbon will be the positive pole and theother the negative pole of the battery. Place the box inthe left hand corner of the shelf in the lower portion ofthe cabinet and bore two holes an inch apart about 6 inchesabove the cells in the back of the cabinet, through theseholes pass the two wires. Get a neat polished board ofthe same wood as the cabinet made in the form of a shallowtray (\ inch deep), to fit the
. Dental electro-therapeutics. zinc unconnected, to eachof these attach a wire two yards long but let the first wirebe blue and the last be red to distinguish them. The wirefrom the first carbon will be the positive pole and theother the negative pole of the battery. Place the box inthe left hand corner of the shelf in the lower portion ofthe cabinet and bore two holes an inch apart about 6 inchesabove the cells in the back of the cabinet, through theseholes pass the two wires. Get a neat polished board ofthe same wood as the cabinet made in the form of a shallowtray (\ inch deep), to fit the side of the cabinet which isnearest to the operator as he stands by his chair; to this7 98 ELECTRO-PH YSICS board first assemble a milliampere-meter, shunt rheostat,current reverser, and two screw terminals with the polesmarked on them. These all have contact screws whichpass through the board to the tray-like surface at the backwhere the connections with the battery are made withinsulated wire in the following manner: Fig. 35. Switchboard with parts assembled. To the —terminal connect the red wire from the battery. To the distal end of the contact rheostat attach theblue wire, connect the other end of the rheostat with oneupright of the milliampere-meter and from the other up-right take a wire to the + terminal screw. The batteryis now complete, but for a current reverser which caneasily be included if desired, but which makes this de-scription a little more complicated, and has not been in-cluded in the description, which it is desired to make assimple as possible. The board, when the several parts areconnected up, is screwed on to the side of the cabinet, and SWITCHBOARDS 99 the outfit is a fixture from which the current can be switchedon at will. Such a battery will supply current for ioniza-tion, gold plating, and many kinds of work for which anordinary continuous current is desired in dental practice.
Size: 1518px × 1646px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialeafeb
