Telescopes for solar research; from Scheiner's Helioscopium to De la Rue's Photoheliograph...Word doc...Plain text. --Harriot, Fabricius, Galileo, Castelli, Scheiner, Hevelius, Hooke, Cotes, Wilson, W. Herschel, J. Herschel, Hodgson, De La Rue. --PA
...Binocular signed by Carston Diederich Ahrens, London, circa 1880s. Ahrens, a prism maker, was granted English patent 1710284, 31 December 1884, for 'Improvements in the construction of erecting binocular prisms'. Courtesy of the Louwman Collection of Historic Telescopes....Image 1 -28kb....
Image 2 -34kb....
Image 3 -52kb.
Fontenelle --image, 315kb...Bernard le Bouyer Fontenelle (1657--1757), Conversations on the Plurality of Worlds, 1686: '...as princes monopolize the earth, it is but fair that astronomers should have the sky for their share, and not suffer princes to intrude on their domain.'
-----photography through the microscope-----
Relic chondrule in Dhurmsala. --4 mm x 2 mm, crossed polars. Amphoterite LL6 ohc, 18% Fe, olivine Fa27. Barred chondrule; also a relic chondrule - partially re-melted and combining 2 structures. Mostly olivine. Surrounding area is a porphyritic chondrule containing the relic, and thus a compound chondrule. 226 kb. --(PA)
Mount St. Helens ash. Dark field. -- ~1/2 mm. Glass shards form as magma moves toward surface, decreased pressure and temperature, molten silica solidifies between grains into threadlike shards. 216 kb. --(PA)
The first four are stereo pairs to view on a standard monitor, smaller files than those following:
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Updated 15 June 2009. All texts and images by Peter Abrahams are copyright 2008.
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