A very interesting burning candle experiment may be performed with two drinking glasses, a small candle end and a piece of blotting paper, says the Pathfinder. The glasses must be the same size and of the thin-glass kind. The candle…
How to Build a Canoe – Wood and Canvas Canoe Plans – excerpt from the book “The Scientific American Boy” by A. Russell Bond A strip of spruce 1 inch thick, 3 inches wide and 12 feet long served as…
Our eyes are good enough for simple stargazing. But they tell us very little about what the stars are really like. To see the stars more clearly and find out about them, we need to look through a telescope. The…
The hydrometer is an instrument used in determining the specific gravity of a liquid, such as acids, etc. The specific gravity of any material is the ratio of the weights of equal volumes of the material and water. Thus if…
A galvanometer is an instrument used to detect the presence of an electrical current in a circuit or to measure the value of the current in amperes. The operation of practically all galvanometers is based upon the same principle, and…
How to Make a RheostatIn operating small motors there is as a rule no means provided for regulating their speed, and this often is quite a disadvantage, especially in the case of toy motors such as used on miniature electric locomotives.
How to Make an Anemometer for a Science Project – An Electric Anemometer By Wm. H. Dettman The construction of this instrument is so simple that any amateur can make one and if accurate calibrations are desired, these can be…
The elevator shown in Fig. 96 is a unique mechanical toy well worth one’s making. Release the little car at the top floor, and it will descend to the ground floor, and then return to the starting point, without you…
An exceedingly interesting machine is the so-called wondergraph. It is easy and cheap to make and will furnish both entertainment and instruction for young and old. It is a drawing machine, and the variety of designs it will produce, all…
A windmill for developing from 1/2 to 2 hp. may be constructed at home, the expense being very small and the results highly satisfactory. The hub for the revolving fan wheel is first constructed. – – – Excerpt from the…