Handy man's workshop and laboratory . th a pencil. This gives an accurate joint foryour plank. The usual way of determining the sweep of the plankis by laying on the thin batten and measuring distances along theedge of the sheer strake with dividers or a foot rule, which is a littlecomplicated, not nearly as accurate, and considerably slower.—6 FORGING A MAST HEAD OR BOOM RING On account of the severe strains to which the lugs on a mast-head are subjected, they and the ring are usually made from one and the same piece of iron, in-stead of the former beingwelded on after the ring ismade. The ri
Handy man's workshop and laboratory . th a pencil. This gives an accurate joint foryour plank. The usual way of determining the sweep of the plankis by laying on the thin batten and measuring distances along theedge of the sheer strake with dividers or a foot rule, which is a littlecomplicated, not nearly as accurate, and considerably slower.—6 FORGING A MAST HEAD OR BOOM RING On account of the severe strains to which the lugs on a mast-head are subjected, they and the ring are usually made from one and the same piece of iron, in-stead of the former beingwelded on after the ring ismade. The ring is made intwo halves, the iron being cutsufficiently long to make twolugs, and go half way roundthe masthead or ends of mainor jib boom. The comparativelength of the iron is given inFig. 348 at 1. The diameterof the bands, of course, varies,and the section of iron used isin proportion. The positionof the lugs is marked out, andthe bar heated and bent intoshape (2), the ends beingforging of a masthead shaped for welding, when the. HANDY MANS WORKSHOP AND LABORATORY 423 two halves are brought together, to form the circle. The lugsare closed and welded on the next heat (3). At 4 is shown thehalf band, a similar one being made in the same manner. Theholes for the wire ropes are countersunk on both sides, and aremade at the roots of the lugs, close up to the bands. They areflattened out when being welded, their depth being a little morethan the depth of the band, to give more metal in the direction ofthe pull. To give >a smooth surface on the inside of the band, a piece ofmetal called a fish is welded in the gutters formed at the rootsof the lugs. These several details are shown at 5. The two halvesare next welded, as shown in the completed band (6). The out-side edges of the band, top and bottom, are rounded off, and allsharp corners on the lugs removed, to prevent any accidental wearon the ropes. The top of the mast or ends of the booms are cutdown to a shoulder, the thick
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Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectworkshoprecipes
