Fig. 32.—The Prime Conductor or Collector. ........................ Fig. 33.—The Complete Cylinder Electric Machine. .................. Fig. 34.—Paper Pattern for laying out the Plates. ................. Fig. 35.—Plate with Sectors in Position, and a Pattern for the Sectors. .......................................................... Fig. 36.—A Side View of one of the Bosses, showing the Brass Bushing used. ............................................................. Fig. 37.—The Frame. ............................................... Fig. 38.—The Upright. ............................................. Fig. 39.—The Driving-Wheels and Axle. ............................. Fig. 40—The Boss and Axle. For sake of clearness, the Plate is not shown. ............................................................ Fig. 41—Showing how the Ball, Comb, etc., are mounted on the Glass Rod. .............................................................. Fig. 42.—A Comb or Collector. ..................................... Fig. 43.—Showing how the Tinsel Brushes are arranged on the "Neutralizer" Rods. ............................................... Fig. 44.—The Complete Wimshurst Electric Machine. B B B B, _Brushes_. C C, _Combs_. D B, _Discharge Ball_. I I, _Glass Rods_. H, _Handle_. Q Q, _Quadrant Rods_. S S S S S, _Sectors_. S G, _Spark-Gap_. P P, _Driving-Wheels_. For the sake of clearness, several of the sectors are not shown. ............................. Fig. 45.—The Leyden Jar. .......................................... Fig. 46.—A Wooden Mortar for Igniting Gunpowder. .................. Fig. 47.—An Electric Umbrella. .................................... Fig. 48.—A Lightning Board. ....................................... Fig. 49.—An Electric Dance. ....................................... Fig. 50.—An Electric Whirl. ....................................... Fig. 51.—Lichtenberg’s Figures. ................................... Fig. 52.—The Voltaic Cell. ........................................ Fig. 53.—The Elements of Simple Voltaic Cell. ..................... Fig. 54.—A Home-Made Voltaic Cell. ................................ Fig. 55.—Carbon-Cylinder Cell, and Cylinder. ...................... Fig. 56.—A Leclanche Cell, showing the Porous Cup. ................ Fig. 57.—A Dry Cell. .............................................. Fig. 58.—The Different Operations involved in Making a Dry Cell. .. Fig. 59.—A Zinc-Carbon Element, made from Heavy plates. ........... Fig. 60.—A Method of making a Cell Element from Carbon Rods. ...... Fig. 61. An Element made from two Carbon Plates and a Zinc Rod. ... Fig. 62. A Method of Mounting four Carbon Plates. ................. Fig. 63.—A Battery Element arranged for three Cells. .............. Fig. 64.—A Plunge Battery, with Windlass. ......................... Fig.