1 in. apart, in a straight line along the pipe.  The valves screwed into these holes appear as shown in Fig. 2.  The whistles are made from pipe of a diameter that will fit the valves.  No dimensions can be given for the exact lengths of these pipes as they must be tried out to get the tone.  Cut ten pieces of this pipe, each one of a different length, similar to the pipes on a pipe organ.  Cut a thread on both ends, put a cap on the end intended for the top, and fit a plug in the other end.  The plug must have a small portion of its side filed out, and a notch cut in the side of the pipe with its horizontal edge level with the top of the plug.  This part of each whistle is made similar to making a bark whistle on a green stick of willow.  The pipes are then screwed into the valves.

The whistles may be toned by trying out and cutting off pieces of the pipe, or by filling the top end with a little melted lead.  The 1-in. pipe must have a cap screwed on one end and the other attached to a steam pipe.  The steam may be supplied by using an old range boiler, placed horizontally in a fireplace made of brick or sheet iron.  If such a boiler is used, a small safety valve should be attached.  The keys and valve operation are shown in Fig. 3.  This is so plainly illustrated that it needs no explanation.  —­Contributed by Herbert Hahn, Chicago.

** Sharpening Scissors [419]

When sharpening scissors on a grindstone it is very difficult to procure a straight edge.  For those not having the facilities of a grinding arrangement a very handy device that will produce a straight and sharp edge can be easily constructed as follows: 

Procure a block of wood, 1-1/2 in. long, 1 in. wide and 1/2 in. thick, add saw a kerf square with the face of the block, as shown at A. Attach a piece

[Illustration:  A Block of Wood Fitted with a Piece of Emery Cloth for Sharpening Scissors Correctly]

of fine emery cloth in the kerf, at B, with glue, taking care to have it flat on the sloping surface only and allowing no part of the cloth to turn the sharp corner and lie on the back side.  Apply the block to the scissor blade as shown and draw it back and forth from one end to the other, being careful to keep the back side of the blade flat against the block.  Without being familiar with scissors grinding, anyone can sharpen them correctly with this block.  —­Contributed by Harriet Kerbaugh, Allentown, Pa.

** Counter Brush for a Shop [419]

A very serviceable brush for use around a shop can be made from a discarded or worn-out push broom as shown at A. Pull out the bristles from one-half of the brush and shape the wood of that end with a knife or

[Illustration:  A Discarded Push Broom Shaped to Form a Brush for the Bench or Counter]

spokes have to the form of a handle, and the brush will be formed as shown at B.  —­Contributed by James T. Gaffney, Chicago.

** A Curtain Roller [419]