386 Barus and Strouhal — Note on Tempered Steel. 



The result of this work is therefore that the result announced 

 by Fizeau is essentially correct ; and that the luminiferous ether 

 is entirely unaffected by the motion of the matter which it permeates. 



Art. XXXVII. — Note on the Structure of Tempered Steel ; 

 by C. Barus and V. Strouhal. 



In view of the experiments on the structure of steel by Dr. 

 Hen nig* now in progress in Professor Kohlrausch's laboratory, 

 we avail ourselves of the permission of the Director of the 

 Geological Survey and of the Editors of this Journal, to insert 

 a brief but typical example of our own results here. The 

 complete paper will appear in Bulletin No. 35 of the Geological 

 Survey, now in the hands of the Public Printer. 



The steel cylinder (length 6 cm., diameter 3 cm., weight 332 g.) 

 to which the data refer was quenched glass-hard in the ordi- 

 nary way. The consecutive cylindrical shells were then re- 

 moved by galvanic solution, and the necessary measurements 

 made to determine the density of each. 



Let A be the density (0° C.) of the consecutive cores. Let 

 R, #, d, be the mean radius, thickness and density, respectively, 

 of the consecutive shells. Then if the ?ith core be left after the 

 removal of n shells, the table gives the digest in question. 



Shell or 

 core No. 











1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 Warlinston- 



8337 

 7744 

 7734 

 7727 

 7742 

 7734 

 7750 

 7784 

 7813 

 7817 

 7841 

 7869 

 7894 

 7919 

 7911 

 7937 

 7979 

 7999 

 8017 

 8013 

 8027 

 8009 



.•49 



o- 



•47 



o- 



■43 



o- 



•40 







•37 



o- 



•33 



o- 



•28 



o- 



•23 



o- 



•19 



o- 



•15 



o- 



•10 



o- 



•05 



o- 



•00 



o- 



•96 



0( 



■92 



o- 



•88 



0-( 



•84 



0-( 



■80 



OH 



•75 



0( 



•69 



o-( 



•02 

 ■03 

 •03 

 03 

 •03 

 •05 

 ■05 

 •05 

 •03 

 ■05 

 •05 

 •05 

 •05 

 •04 

 •04 

 •04 

 •04 

 •05 

 05 

 •07 



7-807 

 7-783 

 7739 

 7-794 

 7-733 

 7-737 

 7-743 

 7-776 

 7-735 

 7-751 

 7-762 

 7-764 

 7-800 

 7-760 

 7-745 

 7-776 

 7-781 

 7-805 

 7-792 

 7-811 



Remarks. 

 Before quenching. 

 After quenching. 



Core perceptibly fileable. 



Prague, April, 1886. 



*Wied. Ann., sxvii, 351, 1886. 



