Ideal Home Life - online book

A valuable and well-organized system for home education(homeschooling) 3 to 12 years.

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two bearings as shown in the upper drawing at K. The pis­ton head can be made by using the cylinder as a mold and pouring in about three-quarters of an inch of hot lead, then forcing it out. Attach the piston rod so that it works freely like a hinge. The piston head should have a groove around the middle for packing as piston rings in an automobile engine, but this is not absolutely necessary if you get a nice fit other­wise.
The piston rod is made from 3/16-inch brass rod slightly flat­tened on both ends so that you can bore a small hole, one for
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