354 Peirce — Indioction Coefficients of Hard Steel Magnets. 



Table V. — Twice-hardened Round Tool Steel. 



Diameter in 

 centimeters. 



Length In 

 centimeters. 



Moment per 

 gramme of the 

 magnetism in- 

 duced in the twice 

 harrlened but un- 

 seasoned and un- 

 magnetized sped 

 men wlien placed 

 " lengthwise " in a 

 unit field. 



Moment per 

 gramme of the 

 magnetism in- 

 duced in the twice 

 hardi-ned and seas- 

 oned magnet when 

 placed " length- 

 wise" in a unit 

 field. 



Permanent mag- 

 netic moment per 

 gramme of the 

 twice hardened 

 and finally sea- 

 soned magnet. 



0-95 



20 



0-31 



0-29 



30-0 



0-95 



18 



030 



0-28 



26-0 



- 0-95 



15 



0.28 



0-26 



20-5 



0-95 



10 



0-23 



21 



13-0 



95 



6 



0-17 



0-16 



7-5 



0-95 



4 



0-12 



012 



5-0 



Table YI. — Square Jessops Tool Steel 





Moment per gramme r, 



f magnetism 



, 





•u"? • a) 





induced in the 



specimen when placed 



%a 



<I> O 



e§,fe^ 



JO 





lengthwi 



se " In a unit field. 





'SSS'.ol 



<U 







A o 



•o'S 





.£S^^§ 



a 



«s 





fe , ft-.d 



^.s . 







sis 



tjSogs 





o ^ 





& -- K X o 



1 _ «-' c 



o-d 



sS;z; 



S'S <u 



■RSaSoS 

 ^ E3 pi a «bO 





 « 



a 



lil 



Us 



1 



a^^5s 



Ills 



So 

 S o 



§il 





a&" 



S a <u be 



g 0) 03 es 



^ 





^ 



< " 



<^ 





^. 



^ 



<3 



4 



0-12 



0-10 



0-10 



0-08 



0-10 



4-5 



4-5 



0-022 



6 



0-18 



0-14 



0-14 



0-12 



014 



7-0 



70 



0019 



8 



0-24 



18 



0-18 



0-15 



0-18 



11-5 



11-5 



0-016 



-10 



0-29^ 



0'21- 



a- 21 



0-17 



0-21 



16-5 



16-0 



013 _ 



12 



0-34 



0-23 



0-23 



019 



0-23 



21-0 



20-0 



0-011 



14 



039 



0-25 



0-25 



0-20 



0-25 



26-0 



24-5 



0-010 



16 



044 



0-27 



0-27 



0-21 



27 



31-0 



290' 



0-009 



18 



048 



0-28 



0-28 



0-22 



0-28 



360 



33 



0009 



20 



0-52 



0-29 



29 



0-23 



0-30 



4T0 



38-0 



0-008 



Cross-section— -0-67 sq. cm. Weight per cm. of length=5-28 grammes. 



Table Yll. 



Flat Tool Steel. 



Length in centime- 

 • ters. 



Moment per gramme 

 of magnetism induced 

 inthet^e soned mag- 

 net wh. n placed 

 "lengthwise" in a 

 unit field. 



Permanent magnetic 



moment per gramme 



of the seasoned 



magnet. 



Approximate ratio of the 

 induced magnetic moment 

 • caused in th ■ seasoned 

 magnet by a unit fieid to 

 the permanent moment 

 01 the magnet. 



6 



8 



10 



15 



20 



0-18 

 0-22 

 0-24 

 0-29 

 0-33 



110 

 15 



18-5 

 27-5 

 36-5 



0018 

 0-015 

 0013 

 0011 

 0009 



Weight per centimeter of length=3-9 grammes. 

 Cross-section = 1 Q cm, x 0-32 cm. 



The Jefferson Physical Laboratory, 

 Cambridge, Mass., August, 1896. 



