FIG. 1.—A simple Wimshurst Machine which any boy can easily make. P P, Plates; BR, Neutralizes; C R, Collectors; DR, Discharge Rods; J J, Leyden Jars; H H, Insulating Handles; C, Crank; U, Upright; B, Belt. ............................................................. FIG. 2.—The plates for the Static Machine are made of hard rubber and are 7 inches in diameter. Each plate carries sixteen tinfoil sectors. .......................................................... FIG. 3.—The details of the Tinfoil Sector. Sixteen are required for each plate. They are stuck to the plates with shellac. ............ FIG. 4.—Details of the Grooved Pulley, attached to each plate. The Pulleys are turned out of wood. ................................... FIG. 5.—The base of the Wimshurst Machine. All woodwork about the machine should be carefully dried and then shellaced so that it cannot absorb any moisture. ....................................... FIG. 6.—Details of one of the Uprights which support the Plates, Driving Pulleys, etc. These, being made of wood, should also be dried and shellaced so that they cannot absorb moisture. .......... FIG. 7.—Showing the Two Uprights in position on the Base. ......... FIG. 8.—The Driving Pulleys. These are turned out of wood and mounted on a shaft having a Crank at one end. ..................... FIG. 9.—The Crank is bent out of a piece of 3/16 rod, 7 inches long, into the shape shown. ............................................. FIG. 10.—The Collector with the Discharge Rods, etc, in position. A is the Brass Ball forming one terminal of the gap across which the sparks jump. B is another Brass Ball screwed onto the end of the Collector Rod and having a hole in it, through which the Discharge Rod slips. CC are two threaded Washers used to clamp the Discharge Rod in place. ..................................................... FIG. 11.—Showing how Binding Posts may be substituted for Round Balls on the Collector Rods. ...................................... FIG. 12.—Details of the Discharger Rods. .......................... FIG. 13.—The Supporting Bar upon which the Collector Rods are mounted. Made of hard rubber so as to be a perfect Insulator. ..... FIG. 14.—The Neutralizers. Two are required. They are bent out of Brass Rod and fitted with a Tinsel Tuft at each end. The centre piece upon which the Rod is mounted should be of Hard Rubber. .... FIG. 15.—Details of the Leyden Jars. They are simply small Test Tubes, coated inside and outside with tinfoil for about two-thirds their height and fitted with a Brass Rod connected with the inside coating. .......................................................... FIG. 16.—A Large Leyden Jar for experimental purposes. ............ FIG. 17.—Showing how to Discharge a Leyden Jar with a curved piece