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Each Negative Was Locked: In the fall of 1843 Talbot set up a photofinishing laboratory in Reading, The Talbotype Establishment, and put Henneman in charge. Each negative was locked in a frame with the sensitized silver chloride printing-out paper in contact with it and exposed to sunlight for periods ranging from a few minutes to an hour or more, until an image appeared. The print was then fixed, washed, and dried.
A typical Lunar Orbiter mission began with a launch from Cape Kennedy, Fla., atop a two-stage Atlas-Agena rocket. After the spacecraft had been placed on a precisely determined trajectory for the moon, it extended its solar panels to convert sunlight into electrical energy and also spread its radio antennas for communication with the earth. The solar panels locked on the sun, and shortly afterward a special sensor locked on the bright star Canopus.
5. Never be too proud to reshoot a poor negative. Did you make an error in exposure? Did your tripod slip and cause a fuzzy negative? Or did you make one of the other dozens of errors which can almost but not quite ruin a negative? If so, do not try to cover up by struggling with the negative by means of darkroom trickery, but instead shoot the picture over again if that is at all possible. To reshoot is to confess a measure of failure to "your client, of course, but you can make up for that by going all-out for a masterpiece on your second try. |
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