112 



Potts — Rowland's New Method. 



placing the test plate at different points, the uniformity of B 

 was tested. 



Table XII shows the results of this test. It appears from 

 this table that with either 8 or 10 pieces of iron B is practi- 



Table XII. 



Test plate on Test plate next Two plates 



outside of to outside outside of 



No. of bundle. Per cent plate. test plate, 



pieces Lower Upper var. Lower Upper Lower Upper 



of iron. coil. coil. B. coil. coil. coil. coil. 



2 6-51 6-03 3' ______ 



4 4-14 3-82 3- ______ 



6 3-60 3-48 1-9 3'60 3-62 '7 — — — 



8 2-65 2-55 2' 2"7l 2"7l 0- — — — 



10 — — — — — — 2-75 2-85 2- 



cally uniform. With fewer pieces the induction was greatest 

 next the coil, and when more were used the magnetism was 

 not as great in the central pieces. 



Table XIII shows the results of a series of measurements, 

 and in fig. 9 a curve is plotted showing the relation between 

 B and the energy loss per cycle. 



Table XIII. 



Weight of iron = 340 g. Volume=43-3 cc. Area section =981 sq. cm. Di=deflection dyna- 

 mometer by current C. D 2 =same for secondary current. 



3-21-00 



















-115- 



Ro R.3 



R i 



Rj R. i 



H T 



D, 



D 2 



?"i 



? - 2 



1 



913-2 2945 



• ion- 



148-3 313-5 



165-2 -0277 



3-62 



3-18 



166-7 



59-72 



2 



505-9 2140 



1508- 



148-3 356-5 



207-8 -0280 



5-85 



7-40 



166-7 



59-72 



3 



208-6 1106 



2016- 



148-3 380-2 



231-9 -0275 



8-78 



14-70 



166-7 



59-72 



5 



1769- 2408 



507-5 



148-3 372-8 



224-5 -0276 



9-00 



3-00 



166-7 



129-72 



6 



1563- 2100 



507-5 



148-3 377-7 



229-4 -0273 



10-61 



3-86 



166-7 



129-72 



8 



1060- 1431- 



507-5 



153-0 375-9 



222-9 -0267 



4-00 



6-95 



377-0 



129-72 



9 



503-1 1671 



1010-5 



153-0 304-2 



151-2 -0254 



9-60 



14-10 



377-0 



129-72 



11 



206-9 1639 

 B 



2014- 

 0i 



153-1 254-1 

 H per cc. 



101-1 -0255 

 CVHT 



18-10 



14-36 



377-0 



149-8 



1 



2-8S X10 3 



•0262 



3-815 



7-io xio 3 











2 



4-32 X10 3 



•0337 



4-799 



1-524 X10 4 











3 



6-17 X10 3 



•0412 



5-356 



2-51 XIO' 











5 



6-07 X10 3 



•0418 



5-1S5 



2-50 XIO 4 











6 



6-86 X10 3 



•0454 



5-298 



2-98 XIO 4 











8 



S-92 X10 3 



•0576 



5-148 



4-56 XIO 4 











9 



1-207 X10 4 



•0891 



3-482 



7-oo xio 4 











U 



1-318X10 4 



•1226 



2-335 



8-93 XIO 4 











