A Method for the Summation of Irregular Linear Movements

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Abstract
A method for the measurement and summation of irregular linear displacements was developed for application to physiological research in respiration. In principle a light beam is caused to fall upon a photocell after penetrating 2 photographic plates ruled with horizontal lines. The lines on the plates are so arranged that when the plates are suitably superimposed, the lines of one plate will cover the spaces of the other and present a light-opaque surface. One plate is fixed and the other attached to the float of the plethysmographic volume recorder. As the float moves up and down the photocell is alternately blacked out when the 2 grids complement each other and illuminated when the grid lines tend toward coincidence. A Geiger-type counter records the energy bursts from the photocell. Allowance must of course be made for the fact that upward or downward movements record equally well.

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