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** Lock Lubricant [151]
A door lock may be lubricated by using some lead scraped from the
lead in a pencil and put in the lock. This may be done by putting
the scrapings on a piece of paper and blowing them into the lock
through the keyhole.

** Rust Proofing Bolts [151]
Where bolts are subject to rust, the threads should be painted
with pure white lead; then they will not rust fast.

** Painting Yellow Pine [151]
When painting yellow pine exposed to the weather add a little pine
tar with the priming coat.

** Revolving a Wheel with Boat Sails [152]
A novel windmill or revolving wheel can be made by placing a light
wheel so it will turn freely on the end
[Illustration: An Unusual Type of Windmill]
of a post, and placing four small sailing boats at equal points on
the rim of the wheel. It makes no difference which way the wind
blows, the wheel will revolve in one direction. In Fig. 1 the
direction of the wind is shown by the arrows, and how the sails
catch the wind and cause the wheel to revolve. Figure 2 shows how
the wheel will appear when complete.


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