The toy submarine described on the following pages is a model recently devised by the author. A photograph of this toy …

When light passes from one substance to another, it may also change direction. When light rays pass from air to water …

How to Build a Canoe - Wood and Canvas Canoe Plans - excerpt from the book "The Scientific American Boy" by A…

Our eyes are good enough for simple stargazing. But they tell us very little about what the stars are really like. T…

How to Make a Hydrometer - Easy Science Projects The hydrometer is an instrument used in determining the specific gra…

How to Make a Galvanometer - Easy Science Projects A galvanometer is an instrument used to detect the presence of an …

How to Make a Rheostat In operating small motors there is as a rule no means provided for regulating their speed, and…

How to Make an Anemometer for a Science Project - An Electric Anemometer By Wm. H. Dettman The construction of this i…

The elevator shown in Fig. 96 is a unique mechanical toy well worth one's making. Release the little car at the top…