an Electric Micrometer. 



547 



Table II. 



Consecutive Headings showing that the Diaphragm may be 

 relied on to give uniform readings, when subject to repeated 

 displacement and return. The steady creep in readings 

 seen in column 2 is due to fall in temperature. 



Aug. 

 12th. 



Time. 



Normal Contact. 



Displace- 

 ment 

 Contact. 



Move- 

 - meiit. 



0-15 

 014 



0-17 

 015 



0-18 

 013 



0-17 

 019 



015 

 016 



016 

 020 



Mean. 



Current &c. 



Observed 



1 

 Assumed. 



Actual. 



KT 7 cm. 



6.12 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



20 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



30 

 1 

 2 

 3 

 4 

 5 

 6 

 7 



2-10 1 

 200 J 



1-80 

 1-75 



1-56' 

 1-50 



1-20 

 105 



075 

 0-62 



0-44 

 030 



OiO 

 000 



1-95 



1-87 



1-68 

 1-67 



1-38 

 1-27 



097 

 0-83 



0-60 

 0-46 



0-27 

 0-15 



1-80 

 1-73 



1-85 



1-82 



1-20 

 114 



114 



1-12 



0-45 

 0-30 



0-43 

 035 



0-145 

 0160 

 0155 

 0-180 

 0155 

 0-180 



151 

 16-6 

 161 



18-7 

 161 



18-7 



/ 1,430 V. 

 1 10,000 oj. 



Direct. 



Eeversed. 



Direct. 



Reversed. 



Direct. 



Eeversed. 



Mean of 

 Mean of 



three direct =15-8x 10 -7 cm. 

 three reversed = 18 - 0x 10 _7 cm. 



