shown in Fig. 12.  The sail is a triangle, 9-3/4 by 9-3/4 by 8-1/2 ft. which is held to the boom and gaff by cord lacings run through eyelets inserted in the muslin.  The eyelets are of brass placed 4 in. apart in the muslin.  The mast has two side and one front stay, each fitted with a turnbuckle for tightening.  A pulley is placed at the top and bottom of the mast for the lift rope.  The sail is held to the mast by an iron ring and the lift rope at the top of the mast.  The boom rope is held in the hand and several cleats should be placed in the cockpit for convenience.  A chock is placed at the bow for tying up to piers.  Several coats of good paint complete the boat.  —­Contributed by O. E. Tronnes, Wilmette, Ill.

** A Home-Made Hand Vise [201]

A very useful little hand vise can easily be made from a hinge and a bolt carrying a wing nut.  Get a fast

[Illustration:  Hand Vise Made from a Hinge]

joint hinge about 2 in. or more long and a bolt about 1/2 in. long that will fit the holes in the hinge.  Put the bolt through the middle hole of the hinge and replace the nut as shown in the drawing.  With this device any small object may be firmly held by simply placing it between the sides of the hinge and tightening the nut.

** Proper Design for a Bird House [201]

This bird house was designed and built to make a home for the American martin.  The house will accommodate 20 families.  All the holes are arranged so they will not be open to the cold winds from the north which often kill the birds which come in the early spring.  Around each opening is an extra ring of wood to make a longer passage which assists the martin inside in fighting off the English

[Illustration:  Bird House]

sparrow who tries to drive him out.  The holes are made oval to allow all the little ones to get their heads out for fresh air.  The long overhanging eaves protect the little birds from the hot summer sun.  The rooms are made up with partitions on the inside so each opening will have a room.  The inside of the rooms should be stained black.

** Boomerangs and How to Make Them [202]

A boomerang is a weapon invented and used by the native Australians, who seemed to have the least intelligence of any race of mankind.  The

[Illustration:  Details of Three Boomerangs]

boomerang is a curved stick of hardwood, Fig. 1, about 5/16 in. thick, 2-1/2 in. wide and 2 ft. long, flat on one side, with the ends and the other side rounding.  One end of the stick is grasped in one hand with the convex edge forward and the flat side up and thrown upward.  After going some distance and ascending slowly to a great height in the air with a quick rotary motion, it suddenly returns in an elliptical orbit to a spot near the starting point.  If thrown down on the ground the boomerang rebounds in a straight line, pursuing a ricochet motion until the object is struck at which it was thrown.