John J. Rebeske, Jr.
naca-tn-2118
Jun 1950
An optical torquemeter the indicating system of which requires no physical connection to the torsion shaft was constructed, and the performance under static and dynamic conditions investigated.
An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1950/naca-tn-2118.pdf