| Show WITH CAST kyto IRON inon q tile interest ing fact is developed by experiments of the U S ordnance de department apartment part ment that iron ly by repeated repented 1 fusion ruslon up to toa a certain number of times limes is thereby greatly improved in anns gnus cast solidly and those cast hollow hallow through A aich hitter latter water was made lo 10 circulate after casting ra sting showed all an astonishing difference in their relative strength ilia e merence difference being in favor lavor vor of the hollow cast 9 gun un which is attributed to the method of coo cooling ing tile the solid gun contracting froin from the tiie outside exer 1 ling ing a strain upon the arrain arrangement gement of the particles of tile the metal in the same direction as the strain 0 of f tho the discharges the experiments also showed that od cast ings are a great deal stronger then new eight inch idich guns proved thirty das da a otter bein being cast solid 6 stood I 1 0 ad but 72 charges thirty four days E 84 C charges 11 arges one hundred days charges cli cil arges and six years 2582 2532 charges this phenomenon is accounted for by supposing that the particles strained in the cooling readjust themselves in the to the ar new position and free or nearly so these aie important facts for engineered engine ers erf |
