Part 9 (1/2)

[Illustration: Fig 68]

[Illustration: Fig 69]

APPARATUS 92

_128 Crank for Winders, etc_ Fig 69 This form of crank or handle will be found easier to make than the one in which a wire is expanded in the slot of a stove bolt, and it can be used for many purposes, especially where dowels serve as axles Wrap a little paper around the end of the 1/4 in dowel, D, and push it part way into the spool, A, then put in a set-screw, S, to keep A froht end of the wire, H, should be put into a hole, B, and another set-screw used to fasten it into the spool

APPARATUS 93

_129 Winder_ Fig 70 For winding bolt nets, this form of winder is very useful It consists of a ”stove bolt,” S B, 2 in long (total length) and 5/16 in in dia 70]

130 Handle or Crank, H, is , bent at the lower end as shown H is fastened into the slot of S B To do this the end of H is hammered flat until it will just slip into the slot Itit so that it will press out against the sides of the slot To do this, place S B into a hole in an anvil, or hold it in a vise, being careful not to injure the thread Place the flattened end of H in the slot, and strike it on top so that it will expand and be pinched in the slot; but do not pound it so hard that you split the bolt head Three or four good center-punch dents upon the wire over the slot will help to expand it

131 The Fra

70 A 5/16 hole should be h about 1/4 in so that the winder-nut, W N, can be turned onto it W N should be on but 2 or 3 threads of S B This will leave part of it for the thread of the bolt net, and when this and S B ainst each other and hold the bolt tight

The winder can be nailed or screwed at S to the edge of a table or held in a vise

APPARATUS 94

[Illustration: Fig 71]

_132 Winder_ Fig 71 This shoinder that can be used for several purposes by arranging different attach 71, where it is being used to wind a bolt ure It is made of 3/4 in wood about 3 in wide, the two outer parts X and Z being nailed to the center one, Y, which is to be held in a vise, or fastened to the edge of a table A 5/16 in hole should be h the upper part X and Z at one side of the center, so that a long 5/16 bolt can be put through and used as described in App 93, if desired A smaller hole, 1/4 in, should be made on the other side of the center for a 1/4 in dowel The dowel, D, is shown, and this size is a little smaller than the hole in ordinary spools, shown at A and B One-quarter in dowels can bepaper around them

Five-sixteenth bolts can be screwed into the spool holes, shown by the boltaround upon the dowel-axle, a set-screw, S S, is needed These are s, No 5 A s in the screw (App 25)

The spools A and B are fastened in this way, by set-screws, to D The handle, H, is made as in App 93, in this case a short stove bolt, S B, being used and screwed into B Fig 69 shows a very simple form of handle for all such purposes, which may be used instead of the one here shown The details of winding on the wire are given under App 88

APPARATUS 95

_133 Attach this addition to App 93 or 94, als can be made The wooden block, A, may be about 2 in square and 7/8 in thick A set-screw, S, binds it to the dowel-axle, D, which is iven, and which is held in one of the fra 85, can easily be done with this, the upright part, with the two spools, being screwed right to A of Fig 72

[Illustration: Fig 72]

CHAPTER XI

INDUCTION COILS AND THEIR ATTACHMENTS

_134 Induction Coils_, or shocking coils, are rather expensive to buy, and altogether too coiven in books The iven is si to directions, you will have an apparatus that will, be able to make your friends dance to a rather lively tune The aulated perfectly (App 103)

Winding Full instructions have been given forof our induction coils is done in the sanets (App 93), or by hand You will find it a very tiresome and troublesome job, however, to wind on 12 or 15 hundred turns of fine wire by hand Make a winder

Several different forms of induction coils are shown The coil is the most important feature, however, and we shall consider that separately

When you understand the construction of one coil, you can readily apply this to the different forms Some form of contact breaker, or current interrupter, is needed also These will be treated by themselves The connections will be discussed under each form of apparatus