refractor

Converse of object

• use: If you are using an achromatic refractor, the focus errors will be larger due to chromatic aberration of the telescope.
• mount: In 1896, Howard Grubb mounted a 26-inch refractor at the Observatory, specifically designed for photographic observations.
• house: Further east and slightly behind is the Victorian dome that houses the 28-inch refractor, the observatory's largest instrument.

Adjective modifier

• 28-inch: Observing Uranus A drawing of Uranus as seen through the Royal Observatory's 28-inch refractor.
• achromatic: There is a little bit of color shift but the filter looks like a good addition to an achromatic refractor.
• small: What should you expect from a small refractor or reflector?
• large: Having access to large refractors made the task easier.
• photographic: This was to be a photographic refractor, with an object-glass of 13 inches aperture and 11 feet focus.
• 26-inch: The telescopes were moved after the Second World War to Herstmonceux, where the 26-inch refractor can still be seen today.

Modifies a noun

• telescope: Among the exhibits is a 28 inch refractor telescope, one of the largest in the world.

Noun used with modifier

• inch: At Wandsworth Common we visited the place where John Craig's 85 foot long 24 inch refractor once stood.