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Updated: May 22, 2025
Since the supply in each butcher's shop was seldom sufficient to let everybody be served in one day, the custom of posting in the windows or advertising in the local papers "Thursday, Nos. 1-500," and later, "Saturday, Nos. 501-1000," was introduced. A few butchers went still further and announced at what hours certain numbers could be served, thus doing away with the long queues.
We must remember that a plate sensitive enough to record instantaneous exposures of 1-500 of a second must be sensitive to any tiny ray of outside light also. Almost any room will make a dark room, especially if it is used at night. By drawing the shades and by doing our work in a far corner of the room away from outside light we are comparatively safe.
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