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"Let any irregularly shpaed body, as a stone or chair, be suspended so as to move freely. Drop a plumb line from the point of the suspendsion, and make it fast or mark its direction. The center of mass will lie in this line. From a second point, not in the line already determined, suspend the body; let it fall a plumb line as before. The center of mass will lie in this line also. But to lie in both lines, it must lie at their intersection." -Avery 1895

Finding the Center of Mass

"Let any irregularly shpaed body, as a stone or chair, be suspended so as to move freely. Drop a plumb…

"An apparatus used to determine pressures beyond those that the McLcod gauge can discern." —The Encyclopedia Britannica 1910

Radiometer

"An apparatus used to determine pressures beyond those that the McLcod gauge can discern." —The…