386 REPORT—1 883. 
Trst or A Bar or Mancanuse Bronze, No.75. 
By Transverse Strain. 
1 inch square, Cast in Sand, placed on supports 12 inches apart, 
Steady pressure applied in middle of Bar. 
Strain Deflection, Per Set, Stenih ul Deflection, Per Set, 
i : Strain on, Strain off, < ’? q Strain on, Strain off, 
in Pounds inches inches CS inches inches } 
896 025 ate 2,688 “21 12 
1,120 03 Sioa 3,136 “44 34 
1,344 EAL Wh) Veer 3,584 "86 ‘73 
1,568 POASiulT Gt aLLEI2 ¢ 4,032 1:62 1-44 
1,792 06 005 | 2 4,144 LO toa py Hackers 
1,904 065 ‘Ol | ca 4,256 Gave way without breaking, 
and bent to aright angle. 
Trsts or MancAanrse Bronze. 
By Torsion. 
Twisting | Amount 
Moments in | of twist 
2 Refer- | Dia- Inch Pounds |in length 
Deer: Lore x nce meter |____-______—_| of one Remarks 
umber Ins. : <- \diameter 
Elastic Break 
baie 3s ing No. of 
Limit 5 
Strain | Turns 
No. 2|U.L.C.| 5,023 | 0°622 | 1,170 | 3,360 | 0183 | Uniform twist. 
cast 
under 
pressure} Do. 5,024 | 0°624 | 1,200 | 3,372 | 0-166 as A 
No. 1 Do. 5,064 *621 | 1,110 | 2,880 | 0:175 | Annealed. 
rolled, 
Rod Do. 5,065 °621 | 1,980 | 3,242 | 0°165 | Rolled hot and tested 
as it came from 
rolls. 
No. 5064 was removed from machine unbroken. 
;, 5065 was broken, showing a clean shear. 
EXPERIMENTS on the Transverse Strength and Toughness of Bars of 
Manganese Bronze as compared with Wrovucut Iron and GuN-METAL, 
made by dropping a weight on the middle of the Bar resting on supports 
at each end. 
WEIGHT OF MONKEY, 50 lbs.; HEIGHT OF FALL, 5 feet; DISTANCE BETWEEN 
Supports, 1 foot ; DIMENSIONS OF BAR, 1 inch square, 14} inches long. 
Of the gun-metal in the annexed table specimens Nos. 1, 2, and 3 
were sent from the locomotive works of one of the railways terminating 
in London, and tested in the presence of an officer of the department, and 
fairly represent the qualities of gun-metal ordinarily found in such works, 
and supplied by brassfounders. Nos. 4 and 5 were cast specially and 
composed of best selected copper, 16 parts, English tin, 2 parts: No. 6, 
of copper, 16 parts, and tin, 23 parts by weight. 
