Part 1 (1/2)
Hoo Boys Made Their Own Electrical Apparatus
by Thomas M (Thomas Matthew) St John
A WORD TO BOYS
The author is well aware that the average boy has but few tools, and he has kept this fact constantly in mind It is a very easy matter for a skilledpieces of apparatus It is not easy to ood apparatus with few tools and a limited amount of skill, unless you follow siiven, any boy of average ability can make the apparatus herein described
Most of the illustrations have beenboys
It is impossible to describe the different pieces of apparatus in any special or logical order It is taken for granted that you have souide for the order, and to give you an idea of just the apparatus needed for the special experiments
It would be foolish to start in andable to intelligently use it in your experiments Take up a systematic course of simple experiments, andany particular piece of apparatus, read what is said about the other pieces of the sareat help, and it est improvements that you would like to have
In case your apparatus does not work as expected, read the directions again, and see if you have followed the connections, poor connections, short circuits, broken wire, etc, will make trouble With a little patience and care you will be able to locate and correct any troubles that may come up in such simple apparatus
THOMAS M ST JOHN
Hoo Boys Made Their Own Electrical Apparatus
CHAPTER I
CELLS AND BATTERIES
APPARATUS 1
_1 Carbon-Zinc Cell_ Fig 1 If you have some rubber bands you can quickly make a cell out of rods of zinc and carbon The rods are kept apart by putting a band, B, around each end of both rods The bare wires are pinched under the upper bands The whole is then bound together by iven in App 15 This method does not make first-class connections between the wire and rods (See -- 3)
[Illustration: Fig 1]
APPARATUS 2
[Illustration: Fig 2]
_2 Carbon-Zinc Cell_ Fig 2 In case you want to make your cell out of carbon and zinc rods, and do not have anyholes for them in the wood, as in App 3 and 4, you will find this rooves, G, into one side of the wood, A, which should be about 4-1/2 1 1/2 in The grooves should be quite deep, and so placed that the rods will be about 1/4 in apart A strip of tin, T, 1/2 in wide, should be bent around each rod The screw, S, put through the two thicknesses of tin will hold the rod in place Another screw, X, acts as a binding-post The zinc rod only is shown in Fig 2 The carbon rod is arranged in the same way Use the fluid of App 15
3 Note When the bi+chro current is given, a other reasons, because the zinc is rapidly eaten up This action goes on even when the circuit is broken, so always remove and wash the zinc as soon as you have finished
APPARATUS 3
_4 Carbon-Zinc Cell_ Fig 3 The wooden cross-piece, A, is 4-1/2 1 1/2 in The carbon and zinc rods, C and Z, are 4 in long 1/2 in in diameter The holes are bored, if you have a brace and bit, so that they are 3/4 in apart, center to center This makes the rods 1/4 in apart