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Updated: May 19, 2025
Jannsen, vol. i. p. 53; Thorpe, vol. iii. p. 70, quoting Afzelius, vol. ii. p. 29, quoting Müllenhoff. "Am Urds-Brunnen," vol. vi. p. 58.
Jannsen photographed, for instance, the transit of the planet Venus across the sun in December, 1874, on a circular sensitized plate which revolved in the camera. The plate moved forward a few degrees every minute. There was room in this way to have eighteen pictures of different phases of the transit on the marginal part of the one plate.
It would also be a pleasant task to investigate the properties of the gnomon of the Chinese, Egyptians, and Peruvians, the scarphie of Eratosthenes, the astrolabe of Hipparchus, the parallactic rules of Ptolemy, Regimontanus Purbach, and Walther, the sextants and quadrants of Tycho Brahe, and the modifications of these various instruments, the invention and use of which, from century to century, bringing us at last to the telescopic age, or the days of Lippershay, Jannsen, and Galileo.
If Elizabeth never discovered Shakespeare, how could she be expected to know Raphael? About Sixteen Hundred Twenty, the year the "Mayflower" sailed, Paul Vensomer, Cornelis Jannsen and Daniel Mytens went over to England from the Netherlands and quickly made fortunes by painting portraits for the nobility. This was the first of that peculiar rage for having a hall filled with ancestors.
Flying pigeons were photographed in different positions, each picture taken in a five-hundredth part of a second. But Marey himself improved the method. He made use of an idea which the astronomer Jannsen had applied to the photographing of astronomical processes.
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