Fig. 320.—The Secondary Head.
The secondary is fitted with two circular wooden heads just large enough to fit tightly into the tube, having a half-inch flange, and an outside diameter of three and seven-eighths inches.
The Base of the coil is fifteen inches long and six inches wide and is made of wood.
The coil is assembled by placing the primary across the base and exactly in the center. Two long wood-screws passing through the base and into the primary heads will hold it firmly in position.
The secondary is passed through the center of the primary and supported in that position by two hard rubber supports, four inches high, seven-eighths of an inch wide and one-half of an inch thick. A brass wood-screw is passed through the top part of each of the supports into the secondary heads so that a line drawn through the axis of the secondary will coincide with a similar line drawn through the axis of the primary.
A COMPLETE COHERER OUTFIT AS DESCRIBED ON PAGE 274.
THE TESLA HIGH FREQUENCY COIL.