1850.] 



THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 



195 



Vn. Redsdale. No. I.— Hoi Blast. 



1. Clear fracture ; colour dark; soft, open j 

 grain iron. 



2. Ditto, as No. 1 bar 



3. Ditto, as Nos. 1 and 2 . 



Mean brealiing weight of the three bars, 794 lb. 



Vlil. Redsdale, No. 1. — Hot Blast. Bars cast from metal sent purposely 

 for testing. 



r 



J. Light grey colour; rather open in i 

 middle. i 



2. Open clear metal, lilie to No. 1 bar.. 



. This har was IjV square; the metal 

 of a clear bright fracture, lilie to the 

 two preceding bars 



Mean breaking weight of the three bars, 919 lb. 

 IX. Tow-Law, No. 3.— Hot Blast. 



Broke; short iron ; light grey colour ; 

 mild and clear. 



2. Clear, good appearance, but evidently 

 tender iron. 



L 



•03 

 •06 

 •095 



•03 



■045 



•U7 



Mean breaking weight of the two bars, 708 lb. 



Average breaking weight of the preceding 25 bars, cast from nine 



sorts of hot-blast iron ........ 826 lb. 



Average ultimate deflection from 23 of the bars . . . . •789 in. 



Average permanent set acquired in 22 of the bars from a weight of 

 6301b -066 



COLD-BLAST IRON. 



I. Staffordshire, No. 2,.— Cold Blast. 



(Number doiibtfid.) 

 Deflection. 



Colour dark; iron soft and open for 

 No. 3 iron. 



Weigiit appliei 

 in lbs. 



(- 406 

 I 518 



630 

 686 

 742 

 + 770 

 B867 



•305 



•40 



•51 



•57 



•64 



■675 



•79 



Set. 



•02 



•035 



•05 



Weight applied Deflection. 



r 



2. Not quite so dark colour as No. 1 bar. / 

 Bar rather full in size. 



Similar fracture to No. 2 bar. 

 defect on bottom side. 



Slight J 



Mean breaking weight of the three bars, 873 lb. 

 II. Crawshay Wekh iron, No. 1. — Cold Blast. 



C 



1. Clear bright fracture; metal open 

 and free. 



2. Ditto, as No. 1 bar 



3. Bar slightly full in size ; metal as in j 

 the preceding bars. ') 



Mean breaking weight of the three bars, 873 lb. 



III. Blaenavon, No. I. — Cold Blast. 



f 406 



I 518 



1. Colour dark grey ; open free iron .. <( 630 



I 686 



1^ B742 



f 406 

 1 518 

 i 030 



1 +686 



L B805 



2. Ditto as No. 1 bar. 



f 406 



Sl'Sl't <; 630 

 I 686 

 I B714 

 Mean breaking weight of the three bars, 754 lb 



3 Ditto as No. 1 and 2 bars, 

 defect on under side. 



34 



46 



62 



715 



79 



35 



465 

 607 

 705 

 91 



36 



485 



65 



735 



IV. Coalirooh Vale, No. \.— Cold Blast. 



r 



1. Close dull fracture; defect in under- 

 side. Bar snapped suddenly. 



Clearer fracture than No. 1 iron 

 ther close for No. 1 quality. 



,..\ 



I 



406 

 518 

 030 

 742 

 B 784 



406 



518 



630 



742 



+ 770 



B90o 



406 

 518 

 630 



742 

 + 798 

 B938 



Mean breaking weight of the three bars, 876 lb 



3. Similar fracture to No. 2 har; slight 

 defect in upper side. Rather full in 

 size. 



r 



L 



•325 

 •42 

 •52 

 •635 



•285 



•38 



•48 



•58 



•61 



•70 



•28 



•37 



•455 



•555 



•615 



■76 



•035 

 •055 

 •095 



•03 7 



•06 

 •105 



•045 



■06 



■11 



■01-2 

 ■015 

 •03 



•015 



•02 



•03 



•015 

 •02 



•025 



27* 



