SOMI: \II;I;<THY STANDARDS OK IM-:SI>TANCE, KTC. 



79 



EXAM n.i: .f Measurements. Tube W. 

 (a.) Mark turned upwards. 



Length of column = 75'9 + 80 left divisions -f 98 right divisions. 

 = 75-9 -I- 78/* + 94/x. 



= 75-9172 centims. 



(l>.) Mark turned downwards. 



Length of column = 75'9 + 73 left divisions -j- 105 right divisions = 75'9 -f- 7 I/A 



+ 101/x = 75-9172 centims. 



Mean of the two positions . . = 75"9172 centims. 



Correction for temperature of metre = + 0'0159 ,, 

 error of metre . . . = 0'0023 



Corrected length .......= 75'9308 centims. at 16'8 C. 



= 75-9210 0-0 ,, 



Histaiice of end from reference mark = 8'95 centims. 



