i »>\l|'Il \ 1 It »\ <U TIIK A. I'". A. TKSTS, KIT. 565
TSie Iron for cast E rvns used for making sand rolls and is of a class similar to Cast I), and must resist Lj'ivat bending strains and sudden heating of their surfaces. The iron used was warm blast charcoal, melted in an air furnace. Though the fluidity strips ran up full, some of the small bars were lost owin^lo the fact. that such iron chilled quickly in a molten slate. The chilled test pieces were \vhite throughout the body, tin- same as wilh i'ast I >. The contraction ranged fnmt.iS in i-inch bars to . i i in .p-ineh bars. This east. was made under the supervision <>f Mr. |. S. Seamen.
The iron used for cast F consisted of shop scrap mixed with old grille bars, r u s t y t h i u malleable scrap, and a white weak pu.» iron, melted in a
V :! .!, " eupo];i. Tin- m i x t u re
;' "'', /. :. ;;ave a perfectly white
t ract ure up to t lie ,» '.. -
iljell !-ieet H »!1S, aiid .slij'Jlt 1 y
mi »t t led in t he center <»!'
i ; t he larj»e liars. It \v;is
iiupract ii-able to machine
5 • this iron, and hence no
1 "'" " such tests are shown. The
fluidity strips <H<1 imt run up full, showing t he effect
of Mxidi/.rt! ir«»ut the chill extending throughout tlu*
wholi- eastiii;.* ni the test pieces. The cont ract ion
ranged lY«»m ./s in the !/ itich bars down to . M in the
I ifii'h bars.
14 T!<i' ' ,»• f ,t!jrl !h»r,r • »-r!i ,il ( i, If, I, J , K, ;Uirj I,, p;i^»'S :;(,M O
'•T •.'.'«•:•«• iii.j'ir uiiiirt !!*.»• ii}H-r\'! .H»n <»! hr. Rsrh.'tnl SlolrlciiKc .i! : •,» l'fjii]-.y!v,iu;.i M.ii!« ,«!.'.. <•*'•, t«.Mii«! i v, I'it l:,l.ui>;, P,i,ll. The chilland j^reen sand showedast on end, us such will tfive truer results than the [J4™inch round bar in general practice, especially in making comparison <>i; the widest ranges in grades.temper '' or damp- ,| |