One person who worked on this experiment previously discovered "third sound" in liquid helium.
One person who worked on this experiment previously discovered "third sound" in liquid helium. Among the sources of noise in this experiment were damping of the polhode period due to random electrostatic patches, and the team noted that whenever the polhode period equaled an integer multiple of the roll period, a loxodromic "jump" occurred. This experiment, which used IM Pegasi as a guide star, was conceived by George Pugh and Leonard Schiff, who determined that a change of 0.040 arc-seconds per year needed to be detected. The apparatus consists of a series of four gyroscopes doused in a liquid helium dewar and a set of SQUIDS to measure the change in magnetization of a superconducting layer. This project discovered a (*) geodetic effect of negative 6601.8 milliarcsecond per year, matching the predictions of parallel transport around a circular loop. FTP, name this NASA experiment headed by Francis Everitt, which measured the frame-dragging effect of the earth in order to experimentally confirm General Relativity.
One person who worked on this experiment previously discovered "third sound" in liquid helium.
Gravity Probe B