EXPERIMENTS UPON HOT AND COLD BLAST IRON 



MANUFACTURED AT THE MILTON 



)N WORKS. (communicated BY MR. W. GRAHAM.) 



HOT BLAST. 



Neither heated nor swaged. 

 No appearance of fracture. 

 Section at bend 1 A — 1^ h 



Heated red and swaged till cold, reduced of 

 No appearance of fracture. [an inch. 



Section at bend — -IJ. 

 „ f Neither heated nor swaged. 

 2ii !> 1 No appearance of fracture. 

 3 ^ „ ( Section at bend 1^—1 J. 

 I „ f Heated red and swaged till cold, reduced ^\ of 

 No appearance of fracture. [^an inch. 



Section at bend 1 J — IJ. 



Neither heated nor swaged. 

 No appearance of fracture. 



Heated red and swaged till cold» reduced -^^ 



inch full. 

 No appearance of fracture. 



No. 8 Refined If square 



No. 9 Refined If in. square.. 



No.lO Rolled 1 J in. square. 



No. 11 Refined 2^ round 



No. 12 Rolled 2J round 



COLD BLAST. 

 Curvature. 



10 

 50 

 100 



10 

 50 

 100 



Note.— In making these experiments the bar 

 used in striking the bar. 



50 



f Heated red and swaged till cold— reduction 



) of an inch. 



( Broke across at fifth blow. 



f Heated red and swaged till cold— reduction J,- 



* of an inch. 



( Broke across at first blow. 



Neither heated nor swaged. 

 No appearance of fracture. 

 Section at bend If— HJ. 

 Heated red and swaged till cold, reduced of 

 an inch— re-heated and allowed to cool 

 gradually. 

 No appearance of fracture. 



Neither heated nor swaged. 

 No appearance of fracture. 



5 Heated red and swaged till cold. 

 ^ No appearance of fracture. 



! placed four inches over the anvil, and a hammer of 24 lbs. weight 



