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An open-field grid test device is described that consists of a series of “electrical grating” contact switches mounted beneath a flexible Plexiglas field. Detection of movement occurs when the weight… Continue Reading
A photocell-actuated tachometer for running wheels is described. The number of counts generated per revolution of the wheel is a function of the number of trip wires inserted in the hub of the wheel… Continue Reading
In the above-mentioned correspondence there is a discrepancy between the tree development scheme used and the basis vectors given. This is pointed out and then corrected.