schlink: hysteresis of indicating instruments 45 



all minor or secondary loops observed over ranges of indication 

 between its own terminal limits. 



6. When the result of (4) is impracticable or inconvenient on 

 account of the uncontrolled nature of the service to which the 

 instrument is subjected, the best average result in the use of an 

 instrument will in general be obtained when its scale values 

 are adjusted to the mean^ of the upper and lower limits of the 

 maximum hysteresis loop rather than to the lower branch thereof, 

 since when the cyclic history is unknown or indeterminate, in- 

 dications within the loop are indefinitely more probable of oc- 

 currence than indications on its periphery. 



* The mean is a first approximation to the position of the "normal" calibralrion 

 line, in the absence of specific information regarding the skewness of the chance 

 distribution of indications across the loop. 



