52 



Prof. J. A. Fleming. 



It had a fairly uniform diameter of about O'Ol inch, and a length of 

 nearly 250 cm. 



The mean diameter of this wire was taken with the micrometer 

 microscope at regular intervals of centimetres with the following 

 results : — 



Diametral Measurements of Nickel Wire, as read by Microscope at 

 regular Intervals of about 5 cm. 



Obs. 



Diameter 



Obs. 



! 



Diameter 



(inches). 



(inches). 



1 



-0097 



26 



0100 



2 



0-0097 



27 



0-0096 



3 



-00975 



28 



-0098 



4 



-0107 



29 



0-0093 



5 



-0100 



30 



0-0099 



6 



-0098 



31 



-0102 



7 



-0100 



32 



0-0098 



8 



-01015 



33 



-00975 



9 



0-01015 



34 



0-0095 



1 r> 

 xu 



U UiUU 



oO 



u uoyo 



11 



-0098 



36 



-00985 



12 



-0100 



37 



-00965 



13 



-01015 



38 



0-0098 



14 



-0099 



39 



-00985 



15 



-0101 



40 



-0101 



16 



-0099 



41 



-0096 



17 



-0099 



42 



-0094 



18 



-01005 



43 



-0098 



19 



-0097 



44 



-0098 



20 



-0098 



45 



-00995 



21 



-0098 



46 



-0098 



22 



-00985 



47 



-0098 



23 



-0101 



48 



-0096 



24 



0100 



49 



0-0099 



25 



-01005 



50 



-0101 



The mean diameter of the wire, as obtained from the above fifty 

 readings, was 0*00985 inch. This was checked by taking the density 

 of the wire with all the usual precautions for obtaining a correct 

 value. 



The length, weight in air, and weight in water were determined to 

 be as follows : — 



Length of the wire 246-98 cm. 



Weight in air 1*1163 grammes. 



Weight in water at 18° C. + suspension... 1-00175 „ 



Weight of suspension 0*1000 „ 



Weight of wire at 18° C. in water 0*99175 



From the above observations the density was found to be 8*96 at 



