Mr. R. H. M. Bosanquet on Electromagnets. 307 



The representation of the numbers derived from the bars 

 with pole-pieces affords results of a similar character. It is 

 not necessary to present the figure showing the nature of the 

 gain in accuracy by introduction of the term proportional to 

 the magnetizing force, as it is precisely similar in character to 

 that already given for plain bars. The two following Tables 

 give the representation of these numbers in the same way as 

 the two last. The coefficient of the magnetizing force in the 

 second table is 12*1 nearly. 



Bars with P.P. (pole-pieces) without Magnetizing-Force term. 

 A + -415(1 8366 -IS) cos 8, 



log - = 2-35933, 



log/= -16500. 



E. 



ft. 





Diffs. 



P- 



Diffs. 



Calc. 



Obs. 





Calc. 



Obs. 



0,000 



290 



293 



- 3 



•00596 



•00593 



+ •00003 



1,000 



905 



855 



+ 50 



•00362 



•00369 



-•00007 



2,000 



1397 



1250 



+147 



•00324 



•00332 



-•00008 



3,000 



1772 



1639 



+133 



•00308 



•00313 



-•00005 



4,000 



2046 



2041 



+ 5 



•00301 



•00301 



•ooooo 



5,000 



2225 



2222 



4 3 



•00297 



•00297 



•00000 



6,000 



2323 



2381 



- 58 



•00295 



•00294 



+•00001 



7,000 



2352 



2381 



- 29 



•00294 



•00294 



•ooooo 



8,000 



2323 



2381 



- 58 



•00295 



•00294 



+ •00001 



9,000 



2240 



2326 



- 86 



•00297 



•00295 



+•00002 



10,000 



2115 



2174 



- 59 



•00299 



•00298 



+•00001 



11,000 



1952 



2041 



- 89 



•00303 



•00301 



+•00002 



12,000 



1756 



1754 



+ 2 



•00309 



•00309 



•ooooo 



13,000 



1532 



1408 



4-124 



•00317 



•00323 



-•00006 



14,000 



1285 



1031 



+254 



•00330 



•00349 



-•00019 



15,000 



1051 



595 



+456 



00347 



•00420 



-•00073 



16,000 



733 



300 



+433 



■00388 



•00585 



-•00197 



17,000 



432 



207 



+225 



•00484 



•00734 



-•00250 



18,000 



118 



118 







01100 



•01103 



-•00003 



