. Farm machinery and farm motors. FIG. 180—A MODERN FARM WAGON WITH BOX BRAKE I t WAGONS, BUGGIES, AND SLEDS 243 as that required of material used in the construction ofwagons and buggies. All wood should be carefully se-lected and thoroughly dried both in air and in black birch is probably best for hubs;best-seasoned white oak for spokes, felloes, bolsters,sandboards, and hounds; hickory is preferable for axles,. FIG. 181—A SECTION OF A WAGON HUB SHOWING THREE METHODS OF FORMING THE SPOKE SHOULDERS. THE ROUND SHOULDERS ARE SAID TO BE MUCH STRONGER AND MORE DURABLE although
. Farm machinery and farm motors. FIG. 180—A MODERN FARM WAGON WITH BOX BRAKE I t WAGONS, BUGGIES, AND SLEDS 243 as that required of material used in the construction ofwagons and buggies. All wood should be carefully se-lected and thoroughly dried both in air and in black birch is probably best for hubs;best-seasoned white oak for spokes, felloes, bolsters,sandboards, and hounds; hickory is preferable for axles,. FIG. 181—A SECTION OF A WAGON HUB SHOWING THREE METHODS OF FORMING THE SPOKE SHOULDERS. THE ROUND SHOULDERS ARE SAID TO BE MUCH STRONGER AND MORE DURABLE although the best straight-grained white oak is good. Allmetal parts should be of good Norway iron or mild Wheels.—All wooden wheels should be dished orthe outer face of the wheel should present a concave sur-face. The dish in the wheel makes it much stronger,which may be illustrated with a paper disk and a papercone. The cone is much stifYer. For front wheels thisdish should be from }i inch to ^ inch, and for rearwheels from 3^ to ^ inch. At one time, wheels weregiven much more dish than at present. An Englishwriter states that cart wheels should be dished as muchas 3 inches. By giving the wheels an excessive amount 244 FARM MACHINERY of dish, the cart bed may be made much wider. It doesnot matter greatly whether the felloes are bent or sawed,as the merits of the two methods are about equal. A-rivet should be placed o
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