TY  - JOUR
T1  - Apparatus for Determining the Standard Deviation Mechanically
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 101
IS  - 711
SP  - 333
EP  - 341
PY  - 1922/07/01/
UR  - http://dx.doi.org/10.1098/rspa.1922.0048
M3  - doi:10.1098/rspa.1922.0048
AU  - Balls, W.
ER  -
