Metallurgy Of Cast Iron

A factor not to be lost sight of at this point is
{lu.- positive manner in which the* device here tie-seribed verifies thai then- is a moment of expan •iioti in molten iron cooling down to a solidified state. P<» demonstrate this by the device shown, it is necessary to east «»nr bar between fixed inm ends which .•annot he moved apart by the strain <>t' the expansion, ind another bar wliiili shall iiave the end at the pointer i* free in the sane! to reeurd any expansion \vhieh may uke plat-i'.
Any oiuk i'xperinu/nting' in this manner will find hat the bar left fret- t<» expand will move the pointer o the right of y.ero from one to two decrees, while the Kir east between the iron ends or yoke will not move he pointer until it starts t«> tin* left, thus showing hat iron will expand if left fret* to do so.
The author wishes to state that he is of' the belief hat with sitf'h a deviee as shown I'tttniders will event sally he able to utilise the expansion of metal to de i<»te the j;rade of hardnes:s ell-., in the short period if one minute after the molten metal has been poured, ["here are several ways in whi«h sueh a <piit k dc'ter ninati»»n «»!' the },;rade. rte., »»i mrtals eonlti be praeti-ally applinl and pn*ye of some value to the ntctal-ur^ieal world,
The anflinr etiiilt! detail all tlie tests which hi" has laile to show tht* I!ioveiiirli!% of llie jxiintrrs it! f'Vrry rw moments, but as wh.it It*- has ^»iven is in a praeti
,il •«! use. all llh.i! is 1 » ? i v.au !** pli»\e file theory jut-atieed by this paper. *«ti*'h nunutt* fietaih* liavi* been miffed, Siilliri' if t»» *.,iv that t!u jirtiieiples in ei aivsiiiii, e«itttraeti(»n and -»tretelling presented are nut result of one *»i two f^peiinients, bin of aamples of which in every-day practice the writer will cite further on.cibly illustrates the great reason why the founder has to fear sulphur in fuel, high-sulphur iron, and to j