Category: Engineering & Technology
The dynamo is not the most simple piece of mechanism extant, and I am inclined to think that many boys would find it rather a poser to make one. At the same time it is perfectly evident that there are heaps of our readers who are very anxious indeed to _try_, at all events, an...
Take two small pieces of brass wire about an inch long, and turn up the ends of each into a hook. Now get a minute piece of ebonite of the same length, and, putting one hook on...
4. PART I.There are many toys which one meets with in the scientific stores, the making of which for themselves would give great satisfaction to enterprising devotees of the electrical ar...
6. PART III.The system on which it works is precisely analogous to that of the electric trumpet, and almost identical with that of the ordinary electric bell, of which I hope to say more in...
2. PART II.Returning to Fig. 1, we must see that the groove A, which forms half the channel in which the armature is to revolve, is 7/8 inch semi-circle. When the two sides are fixed toget...
1. PART I.The dynamo is not the most simple piece of mechanism extant, and I am inclined to think that many boys would find it rather a poser to make one. At the same time it is perfectly...
7. PART IV.We can now proceed to fasten all the parts together. We must have a piece of hard wood for the base, about 3½ inches by 3 inches and 3/8 inch thick. On this the magnet has to be...
3. PART III.While the current is passing you can try the following experiment, to prove that the wire is wound on all right. If it is not wound as described there will be two north poles or...
5. PART II.The trumpets sold in the shops, as a rule, make a very loud noise indeed--in fact, a little of it goes a very long way with most people. The increased sound is probably due to t...