The work of Mr. Fletcher and of the author was done by both of the methods represented in equations (28) and (29). The 9 drops reported upon in Mr. Fletcher’s paper in 1911[89] yielded the results shown below in which

is the number of displacements used in each case in determining

or

.

[TABLE XIV]

1.68125
1.67136
1.645321
1.695202
1.73171
1.65200
1.6684
1.785411
1.6585

When weights are assigned proportional to the number of observations taken, as shown in the last column of [Table XIV], there results for the weighted mean value which represents an average of 1,735 displacements,