Abstract
THE introduction of rapid dry plates having made a general demand for mechanical shutters, a large variety are now offered for sale by the various makers. Many of these shutters are neat and ingenious, but nearly all have a tendency to shake the camera during exposure, and in the only one which I have seen for sale in which this mistake has been avoided the photographic efficiency of the arrangement has been impaired by the opening being made to assume the form of a gradually expanding and contracting hole; the idea being, I am told, that while the opening is small it will act as a stop and secure definition. This, of course, is true to a certain extent how far, I will inquire presently.
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References
This is the form which I use, but I am not aware of any shutter of the kind being in the market.
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MALLOCK, A. Note on Instantaneous Shutters . Nature 35, 324–325 (1887). https://doi.org/10.1038/035324a0
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DOI: https://doi.org/10.1038/035324a0