Download Classic Telescopes A Guide to Collecting, Restoring, and by Neil English PDF

By Neil English

Vintage telescopes are of curiosity to novice astronomers for various purposes. There are the committed creditors, yet there also are many amateurs who love the nostalgia they encourage. those telescopes «feel» varied from any modern telescope and maybe have a distinct skill to reconnect the landlord to a bygone age of craftmanship. This publication takes a glance at conventional telescopes outfitted through the nice software makers of the 18th and nineteenth centuries, rather the dynastic telescope makers, together with Dollond, Alvan Clark, Thomas Cooke & Sons, and Carl Zeiss. additionally incorporated are lesser luminaries similar to John Brashear, John Calver, William Wray, Henry Fitz, and William Henry Mogey.

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Extra resources for Classic Telescopes A Guide to Collecting, Restoring, and Using Telescopes of Yesteryear

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The university achieved the enviable distinction, for a while at least, of having the largest refractor in America. It was put to good use monitoring the motions of Jupiter’s large Galilean moons, and in 1835, Professor Dennison Olmsted and Tutor Elias Loomis used the same telescope to spot Halley’s Comet upon its expected return in the August of that year. The Atheneum was eventually demolished in 1893 and the Dollond telescope donated to the Smithsonian Institute in Washington, D. , where it can still be seen today.

I have an adapter to permit use of a 2-inch diagonal in place of the original prism, so I can use the Cooke with modern eyepieces. The biggest difficulty with using the ‘scope other than its weight is the long tube. 40 2 A Yorkshireman Makes Good Fig. 11 A pristine Cooke lens that saw first light over 150 years ago (Image courtesy of Richard Day) These telescopes, of course, have long been considered choice instruments for measuring double stars. Curious to see what a contemporary double star observer thought of a big Cooke, Bob Argyle, based at the Institute of Astronomy, in Cambridge, England, is a highly skilled binary star astronomer and author of an influential book on the subject.

5 cm, 15 cm (Cooke, my own), 20 cm (Cooke, Cambridge), 30 cm (Cooke apochromat, Cambridge) and 83 cm (Meudon Observatory). The problem is, I have no basis of comparison with other makes. Until 1988, the Northumberland telescope at Cambridge had a 30 cm Cooke apochromat, as the old lens from the c. 19th had worn so much it was too small to safely fit in the original cell. After the devitrification of one component, Jim Hysom made a new lens for that year, 1988. Equally sharp in definition to my eye, but of course an unfair comparison with an apochromat.

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