Click here for full transcript of letter
The following phrase in my letter was slack & inexact:-
“I make the mean error to be about 6 lbs” It should have been “I make the mean of all the differences in the two column to be about 6lbs.”
From one point of view of the problem the distinction is important: i.e. if pairs of entries in the 2 columns be considered as independent estimates of the same unknown facts.