Refractor Sentence Examples
Probably the best example of this type of mounting applied to a refractor is that made by the elder Cooke of York for Fletcher of Tarnbank; the polar axis is of cast iron and the mounting very satisfactory and convenient, but unfortunately no detailed description has been published.
Fraunhofer's chef-d'oeuvre, the great Dorpat refractor, made for Otto Struve about 1820, had a mounting of this type, and was the first equatorial of any importance to be provided with clockwork.
The largest example of his work is the refractor of 24-in.
This was first accomplished by Grubb in the great refractor of 27-in.
For the great refractor more recently erected at Potsdam, Messrs Repsold arranged a large platform mounted on a framework which is moved in azimuth by the dome, so that the observer on the platform is always opposite the dome-opening.Advertisement
The eye end presents an refractor appearance too complicated to be figured here; it has a micrometer and its illumination for the position circle, a micrometer head, and a bright or dark field, clamps in right ascension and declination and quick and slow motion in the same, a finder, microscopes for reading the hour and declination circles, an illuminated dial showing sidereal time and driven by an electric current from the sidereal clock, and counter weights which can be removed when a spectroscope or other heavy appliance is added.
Bresser Skylux 70mm equatorial Refractor - £ 89.99 The New Bresser Skylux offers sharp high quality optics on a sturdy equatorial mount.
If you are using an achromatic refractor, the focus errors will be larger due to chromatic aberration of the telescope.
In 1896, Howard Grubb mounted a 26-inch refractor at the Observatory, specifically designed for photographic observations.
Further east and slightly behind is the Victorian dome that houses the 28-inch refractor, the observatory's largest instrument.Advertisement
Observing Uranus A drawing of Uranus as seen through the Royal Observatory's 28-inch refractor.
There is a little bit of color shift but the filter looks like a good addition to an achromatic refractor.
What should you expect from a small refractor or reflector?
This was to be a photographic refractor, with an object-glass of 13 inches aperture and 11 feet focus.
The telescopes were moved after the Second World War to Herstmonceux, where the 26-inch refractor can still be seen today.Advertisement
At Wandsworth Common we visited the place where John Craig's 85 foot long 24 inch refractor once stood.
Among the exhibits is a 28 inch refractor telescope, one of the largest in the world.
Diffraction spikes on a reflector's star images, caused by its secondary mirror spider vanes, are absent in an unobstructed refractor.
The instrumental equipment of that observatory was somewhat antiquated, his largest telescope being a small refractor of 73 lines aperture, but he selected a line of work to suit the instruments at his disposal, observing nebulae and variable stars and keeping a watch on comets and new planets.
Further east and slightly behind is the Victorian dome that houses the 28-inch refractor, the observatory 's largest instrument.Advertisement
Observing Uranus A drawing of Uranus as seen through the Royal Observatory 's 28-inch refractor.
At Wandsworth Common we visited the place where John Craig 's 85 foot long 24 inch refractor once stood.
Diffraction spikes on a reflector 's star images, caused by its secondary mirror spider vanes, are absent in an unobstructed refractor.
Light that gets shifted through a lens is called a refractor.
The slow motion in right ascension is defective, being accomplished in the Dorpat refractor by changing the.Advertisement