Abstract
IN the course of work on the instantaneous photography of vibrating strings I have found the following device for obtaining a graph-paper effect on the negatives very useful. As a similar device may be of service to other workers I give the particulars and an example of the type of result obtained (Fig. 1). A piece of good quality engraved graph-paper is photographed with a camera such as is used for making lantern-slides, and a print of this negative is made on to a photographic plate, the result being opaque lines on clear glass. This “grid-plate” is then placed in front of the photographic plate to be used, so that the two gelatin surfaces are in contact. The print obtained from the final negative then shows the graph-paper effect, and fairly accurate measurements can be directly read off from the print itself. Care must be taken to focus with the grid-plate in position.
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GEORGE, W. Measurement of Photographic Records. Nature 113, 387 (1924). https://doi.org/10.1038/113387a0
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DOI: https://doi.org/10.1038/113387a0
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