The Journal of the Department of Agriculture, Victoria . t be supposed that a piece of |-in. chain is to be used. Nowthe safe load to apply to a |-in. chain of good quality, would be .g tons;, the number of eighths of inches contained in the iron from whichthe chain is made, being squared and divided by 10. The size of iron for the hook would be the square root of load which,taking the nearest size of bar obtainable, would be i inch diameter andthe length to make it 8 inches. The diameter of iron for the connecting link would require to be\ inch. Adding one-eighth to the diameter of chain
The Journal of the Department of Agriculture, Victoria . t be supposed that a piece of |-in. chain is to be used. Nowthe safe load to apply to a |-in. chain of good quality, would be .g tons;, the number of eighths of inches contained in the iron from whichthe chain is made, being squared and divided by 10. The size of iron for the hook would be the square root of load which,taking the nearest size of bar obtainable, would be i inch diameter andthe length to make it 8 inches. The diameter of iron for the connecting link would require to be\ inch. Adding one-eighth to the diameter of chain will in most instancesbe sufficiently correct. Welding in the connecting link, particularly when the link is small,is a rather awkward proposition, requiring a fair amount of is therefore always advisable to have the length of connecting linkabout double that of the links in the chain. A Pair of Tongs. This is a very useful thing to be able to make, and as the accomplish-ment embraces such exercises as punching, forging, riveting, welding,.. FIG 51. BLACKSMITH S TONGS. [a] Forming the handle, (b) Forming the eye. [c) Ready for welding, (d) The finished jaw. making two objects alike and fitting them together, it affords excellentpractice. Tongs are not made t-o fixed measurements and so the symmetryof the work is dependent upon accuracy of eye, combined with the tasteand judgment of the operator. Mild steel is the best material to use for forging the jaws of is much stronger than iron, and consequently the tongs can be madelighter than if iron be selected. The size of steel used will vary withthe work required of the tongs. The smallest size generally used being|-in. diameter. The illustration, Fig. 51, shows the evolution of each jaw previous toriveting together. About the best advice that the writer can tender the novice attemptinghis first tongs is to obtain a well shaped pair to copy from, and thenproceed by drawing out similar to shape .shown at A. Next
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagricul, bookyear1902
