Page:Popular Science Monthly Volume 92.djvu/784

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��Popular Science Monthly

��grained pine, 1 in. in diameter at center, tapering to ^4 in. at ends, and 6 in. longer tlian the edge of sail to which they are to be laced. This will allow for stretching of sail and for minor errors in

���Diagram of mainsail and mizzen of a forty- five and twenty-three square-foot sail area

cutting and sewing sails to correct di- mensions.

If you are a good enough mechanic to shape your spars from squared stuff, working down to an octagonal surface and then to a tapered round, very well, other- wise let a wood-working establishment shape them out from a dimensional sketch. As the masts will be short enough to be turned, they may be pro- cured from a mill made to sketch at little more cost than the squared stock. Shape the spars first, and smooth and varnish them. Three thin coats of good spar

���Method of lacing the seizing line through screw-eyes and grommet loops alternately

varnish, well dried and smoothed down between each coat, is better than one heavy coat. A wire nail driven into ends of spars will allow varnishing them clear up to the ends without finger marks and also serve to suspend them while drying.

��Each yard is joined to its boom by a pair of heavy brass screw-eyes of from '^i to 1 in. inside ring diameter, screwed into forward ends of booms and spars and connected by a heavy 13-^-in. brass ring. Screw-eyes are opened to admit the rings and then closed upon them. Capping the ends of boom and spar with "^/i in. brass ferrules will obviate danger of splitting.

Lay one of the sails out on the floor and lay its yard and boom along its proper edges. Tie with seizing line the forward corner grommet to the connecting ring, and stretch the sails out along boom and yard, fastening them temporarily to their ends. With a soft pencil mark along boom and spar 1 in. each side of where each grommet (except corner and end grommet) comes. Set a line of brass screw-eyes. Fig. 7, (3/16 in. inside diame- ter) along booms and spar at these marks, being careful to keep them in line, and that eyes are at right angles to length of boom or spar. Tie a loop or ring of seiz- ing line through grommet, excepting the corner end ones. Then lace a piece of seizing line alternately through these loops and the small brass screw-eyes.

���flag

��Hq 10

��The boom jaws, round mast plate and the flag pole plate are shown in the above sketch

Stretch the sail moderately taut, fasten the outer ends by their grommets to screw-eyes set out as far as possible on boom and yard, and then, fastening the lacing at one end to the forward small screw-eye, draw it taut and lash it to the rear one, leaving a foot of extra line for slacking up, which may be wound around boom or spar after the last knot is tied. You may buy boom jaws or make them yourself. In the latter event, get a piece of 1 2-m. half-round brass, 22 in. long, and saw it in halves. Bend and hammer each piece into the shape and dimensions shown in Fig. 8, being careful to have flat surface inside the curve. At a point ^i in. from end of the 3 in. arm drill "and countersink for a 3/16 in. flat-headed machine screw. The same distance from the curve of gooseneck, drill and counter- sink for another. With two brass ma-

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