﻿Barns and Strouhal — Viscosity of Steel. 



453 



different forms of the bifilar adjustment; No. V is the tubular 

 instrument. The index also contains the numbers of the rods 

 or fibers joined together to make the bifilar couple and other 

 information readily understood. Glass and iron fibers are let- 

 tered. It is to be remembered that in the steel measurements 

 one of the pair of wires is always glass-hard, the other annealed 

 as specified. 



Index to Tables. 



T. EXPERIMENTS PROPER. 



Temper of the rod coupled with glass-hard. 



Apparatus 

 No. 



Annealed 20°. 



Annealed 100°. 



Annealed 190°. 



I. 



Table 1, Rods 47, 48. 



Table 5, Rods 3, 4. 

 Table 5A, Rods 43, 44. 





II. 



Table 2, Rods 1, 2. 



Table 6, Rods 5, 6. 

 Table 6A, Rods 45, 46. 



Table 10, Rods 11, 12. 



III. 





Table 7, Rods 7, 8. 



Table 13, Rods 13, 14. 

 Table 13 A, Rods 19, 20 



IV. 





Table 8, Rods 9, 10. 



Table 14, Rods 15, 16.. 



Apparatus 

 No. 



I. 



IT. 



III. 



IV. 



Annealed 360 c 



Table 16, Rods 17, 18. 



Table 18, Rods 21, 22. 



Annealed 450°. 



Table 19, Rods 23, 24 

 Table 20, Rods 25, 26 



Annealed 1000° (soft). 



Table 23, Rods 27, 28 

 (soft). 



Table 24. Rods 29, 30 

 (commercial drawn). 



Table 25, Rods 31, 32 

 (commercial annealed). 



Table 26, Rods 33, 34 

 (annealed from glass- 

 hard). 



II. MISCELLANEOUS EXPERIMENTS. 



Apparatus 

 No. 



Glass. 

 a. 



Glass. 

 b. 



Iron drawn, 

 c, Jc. 



I. 



II. 



Ill, IV. 

 Y. 



Table 27, Rod 35. 



Table 28, Rods 36, 42. 



Table 29, Rod 37. 

 Table 30 A, Rod 50. 



Appa- 

 ratus. 

 No. 



Iron soft. 



Brass tube 

 (thick). 



e. 



Brass tube 



(thin). 



/• 



Misc. soft 

 steel. 



I. 



II. 

 III. 

 IY. 



Y. 



Table 30, Rod 38. 



Table 31, Rods 39, 40. 



Table 32, Rod 41. 



Table 34, 

 Rods 51, 52.. 



