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…
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…
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…
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…
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…
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…
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…
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…
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…