as heavy as the motor or engine can lift and still run.  It must weigh enough to slow the power down a little, but not to stop it.  Mark the position of the weight and start the motor, at the same time accurately measuring time in minutes and seconds it takes to lift the weight from the lowest point to the highest.  Next measure accurately the distance in feet covered by the weight in its ascent and obtain the correct weight in pounds of the weight.

Multiply the weight by the distance covered and divide the result by the number of minutes or fraction of a minute obtained and divide this last result by 33,000 and the quotient will be the horsepower of the motor or engine.

Perhaps an illustration will make this solution much plainer.  Suppose the motor will lift a weight of 1 lb. and still revolve, 30 ft. in 10 seconds or 1/6 of a minute.  Multiplying 1 by 30 we get 30, which divided by 1/6 gives 180.  This in turn divided by 33,000 equals in round numbers 1/200 part of a horsepower.  —­Contributed by Harold H. Cutter.

** Illusion for Window Attraction [239]

Gold fish and canary birds, living together in what seems like one receptacle, make an unusual show window attraction.  Secure two glass vessels having straight sides of the same height, one 18 in. in diameter (Fig. 1) and the other 12 in. in diameter (Fig. 2).  The smaller is placed within the larger, the bottoms being covered with moss and aquarium decorations which can be purchased at a bird store.  Fill the 3-in. space between the vessels with water.  Cut a piece of galvanized screen into circular form to cover the larger vessel, and hang a bird swing, A, Fig. 3, in the center.  Place the screen on top of the vessels so that the swing will hang in the center of the inner vessel.  A weight—­a box filled with sand will do—­should be placed on top of the screen, over the smaller vessel, to keep it from floating.  Moss should be put over the top of the screen so that the two separate vessels can not be seen.

[Illustration:  18 in.  Diameter; 12 in.  Diameter]

[Illustration:  Birds and Fish Apparently Together]

Place the birds in the inner vessel and the fish in the water.  The effect is surprising.  To complete the effect and aid the illusion the vessels can be set in a box lined with black velvet, or on a pedestal.  —­Contributed by J. F. Campbell, Somerville, Mass.

** Cleaner for White Shoes [239]

Finely ground whiting mixed with water to the consistency of paste makes a very good coating for white shoes.  A brush can be used in applying the mixture which will dry in a few minutes.  It is best to mix only as much paste as required for immediate use.  —­Contributed . by L. Szerlip, Brooklyn, N. Y.

** Crossing Belt Laces [239]

Belt laces should never cross on the side next to the pulley as they will cut themselves in two.

** How to Make a Candlestick Holder [240]