Thrust Production from an RF Test Device Measured on a Low-Thrust TorsionPendulum. 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. American Institute
Budapest, Hungary. A variation of the earlier invention, the torsion balance, the Eötvös pendulum, designed by Hungarian Baron Loránd Eötvös, is a sensitive
Saxl, Erwin J.; Allen, Mildred. 1970 solar eclipse as 'seen' by a torsionpendulum. 物理評論. 1971, 3 (4): 823–825. Bibcode:1971PhRvD...3..823S. doi:10.1103/PhysRevD
Saxl, Erwin J.; Allen, Mildred. 1970 solar eclipse as 'seen' by a torsionpendulum. Physical Review D. 1971, 3 (4): 823–825. Bibcode:1971PhRvD...3..823S