Show I 1 TOE tag SCIENCE OF blacksmithing the scientific american says sawing heated 1 ir iron aana and steel in not known or thought t ho aw ht of by blacksmiths and when several fo forks or branches are to be formed from one stock even if the branches required to remain eventus eventually illy nearly in contact and Varal parallel lal to each other the usual method is to split the I 1 end of the iron with ao am awkward chisel I 1 thereby chereb v deforming defer fhe edge of each branch on oa wh which i ch branches must mast be bent asunder for the purpose of hammering squaring aid and shaping the edge of flach atter after which they are baroug brought to together m 0 aether as well as may be usually retaining a roughness in form if not a de deficiency floi eney of form and strength war near the function of the branches instead of this tedious process the iron when heated may be put into a vice vice and the end may be rea readily dily split t with a suitable saw which aou would ld save much labor an hammering 11 and filing A saw for this purpose should he be rawla thicker at the edge than at the back and with uniform umfort tt teeth one twelfth of a an inch apart the saw when used must beof be often dipped in water to prevent its becoming too much heated I 1 there is isalio also a method of sawing or cutting hardened steel which is not generally known as it shoal i be A circular piece oi of I 1 common thin iron plate or sheet iron being adjusted to a lathe or by bv other I 1 means cyms I 1 put pat into a violent rotary motion will vill readi 1 I 1 I 1 ly IT ea cu off a file cilev a cutting tool or tempered without drawing or reducing the t temper emter there is 18 much mystery in the wonderful der uleece effect fr of this buz and ito its cutting utting property is attributed to electricity electrio ity it answers a very convenient purpose however when the shape and form of ir articles are required to be altered without affecting their temper it furnishes a convenient method for teeth to large saws but objectionable on account of the newly out surface being left so hard bard that that they cannot be readily filed by bv a common file connected with the subject of mysterious iou effects effiec ts it may ma y be stated that a bar of a almost any size size may may be instantly sundered while hot by the simple application of a piece of conin common top roll brimstone A knowledge of this fact will be useful when some piece bece of iron work is re required ui r ad to be severed gut but which as is some sometimes tile 1 the cue case it is so constructed and situated that no ordinary chisel or cutting tool can be brought to apply holes may be instantly perforated through bars or plates of heated iron by the application of pointed pieces of brimstone one this phenomenon is curious although it seldom affords much practical utility |