Materials

Basswood (Chap. III., Par. 31) or

White Pine (Chap. III.,

Par. 48).

2 pcs. 7/8"xl 3/4"x 9" S 2 S Fans. 1 pc. 7/8"x 7/8 "x21" S 2 S Shaft and upright. 1 pc. bright tin 5"x7". 2-1 3/4" No. 10 R. H. blue screws. 6-1" No. 17 brads.

Introductory Statement

In certain countries where the power of the wind is used in irrigating and in doing certain lines of work of this kind the windmill gets considerable study and attention. Most of us give but little thought to the direction or power of the wind, except when we occasionally see it turning a large fan on a wind pump.

This windmill which you are to make serves also as a weather vane and will thus indicate the direction as well as the force of the wind. Men who are studying the subject of flying machines have given great study to the same principles by which you are to construct this windmill.

The following references are worthy of careful study:

References:

Land of Dikes and Windmills; Cur Little Dutch Cousins, McManus. L.

C. Page & Co. Windmills in a Country Below the Sea, Carpenter's Geographical Reader.

American Book Co. Harper's Outdoor Book for Boys. Harper & Brothers, Pub. Harper's Machinery Book for Boys. Harper & Brothers, Pub. Mechanical Toys Which a Boy Can Make, Geo. F. Johnson. Longmans,

Green & Co. First Book of Forestry. Ginn & Co. History of Lumber Industry. U. S. Bulletin No. 34.

Wind MILL

Suggestions For Original Design

No. 1

Wheel of Tin

Windmill Specifications

The Fans

As this material is furnished S 2 S, you will hot need to plane the surface. Select the best surface and mark it the working face (Chapter II., Paragraph 2). Plane one edge for a working edge (Chapter II., Paragraph 4). Prepare a working end (Chapter II., Paragraph 5). Measure and cut the length of the fan, as shown in the drawing. In like manner prepare the other fan. Be sure these pieces are exactly the same size.

A study of the drawing will show you that these two pieces are to be put together with a cross-lap joint, crossing exactly at their middle (Chapter V., Paragraph 62). When the two pieces have been perfectly fitted, lay out the curves for the fan blades. This may be done with the compasses, or the curves may be drawn • freehand. With the lead pencil and finger, gauge lines on the edges of each fan blade (Chapter II., Paragraph 8). Take the pieces apart, and with a sharp knife carefully whittle away the wood to the gauge line, forming a graceful curve.