Part 14 (1/2)

As the bolts were no longerenough to re-netize the bolts This operation was rapidly repeated

218 Use If you wish to use the buzzer simply to call some one occasionally, a dry battery or Leclanche cell is best This apparatus is good to work a gravity cell when it needs regulating

APPARATUS 126

[Illustration: Fig 101]

_219 Electric Bell_ Fig 101 Beforethis bell, carefully read the directions and explanations given for the electric buzzer, App 125

The parts are veryof them has been101 from the side, with the letters M and Q at the bottom, you will see that this bell is merely a modified form of App 125

The Base is 7 5 1/2 in To the upper end of this is nailed the cross piece, D To D are fastened the binding-posts

The Parts, F, G, H, I, J, K, L, M, N, P, Q, are the sanet is fastened to the base by a tin strip, C, which is screwed down at both ends By nailing a strip, like D, along the left side of the base, the net may be fastened to this This strip would take the place of the base of App 125

The piece, F, of two thicknesses of tin, is er than it was in App 125; in fact, it projects through L and fore bullet Hold the cutting-edge of a strong knife-blade upon the bullet, and with a few taps of a haash

Put the end of N into the cut, then hammer the bullet so that N will be pinched If you have no bullet, cut a long strip of tin, about 3/8 in

wide, and wind this about the end of N to serve as a ball

The Bell, E, may be taken from an old alarm-clock This is not screwed directly to the base, as it would not ring well After you have the ball, O, properly fixed, hold E, so that O will strike it near its rih to put under E, to raise its riht place This piece must be screwed to the base from the underside, and on to its top is placed the screhich passes through the bell In other words, E is mounted upon a rod which is fastened to the base

The Adjust N a little, O can be made to tap E properly

The Battery for a bell that is to be used much should be an open circuit one, such as the Leclanche, or the ordinary dry batteries It is cheaper to buy a dry battery than it is to make one suitable for bells A and B shoires that lead to the bell froh a push-button

APPARATUS 127

_220 Electric Bell_ By arranging the buzzer of App 125 with a bell, you can use the sa enough to extend entirely through L, and project beyond L for about 2 in To the end of this is fastened a large bullet, or a band of tin

(See App 126)

[Illustration: Fig 102]

APPARATUS 128

_221 Co 102 This apparatus is good for experio to the trouble to make two separate pieces For the dimensions and explanations see App 121 and 125 There is but a slight change in App

125 to make this

222 Connections The inside ends (-- 123) of the ether at S The outside ends are joined to the two binding-posts, Y and Z, made like App 46 A wire, P, joins Y with the screw in T, which is a piece of stiff tin or copper, which presses down upon the top of I In this way a connection may always be had between I and T A wire, R, joins F electrically with X; it is held under the head of the screw, G (See App 125 about adjustments)

223 Operation When you wish to use the apparatus as a buzzer, join your battery wires to X and Z If the current enters Z, it will pass through the h P, T, I, F, and R to X If you use it as a telegraph sounder, join the battery wires to Y and Z