Glass, and Metal Wires subjected to Constant Pull. 527 



that this creep starts at a very definite load and becomes 

 ver\ rapid at a less definite point. 



For the Platinum wire: — 



Diameter = -0506 cm. .*. cross-section = '00202 sq. cm. 



Annealing current = &o amps, for 5 minutes. 



Load per sq. cm. bxlO* 



cross section. 

 All up to 500 kilos. 



654 1-525 



771 2-265 



854 3-22 



952 5-39 



1050 6-73 



1141 11-35 



1217 26-40 



1354 46-40 



1455 138-0 



1560 wire pulled out and broke. 



The curve connecting b with the load is shown in III. b. 

 For Gold wire : — 



Diameter of wire = "043 cm. 

 Annealing current =7*5 amps, for 5 minutes. 

 Load per sq. cm. bxl0 i . 



All up to 180 kilos 



222 1-30 



362 2-61 



432 3-19 



501 4-16 



570 5-03 



At 640 kilos, the wire pulled out so much that the weight 

 rested on the table underneath. 



The curve connecting the load with b in this case is given 

 in III. c. 



For Silver wire : — 



Diameter of wire = '0486 cm. 



Annealing current =16 amps, for 5 minutes. 



All up to 



Load per sq. cm 



6X10 4 . 



cross section. 





330 kilos 







335 



0-479 



396 



281 



486 



6-08 



731 



12-68 



827 



18-08 



At 900 kilos the wire pulled out and broke. 



