Which Joe gave his name to ‘sloppy joes’? We look at five interesting sandwiches and their lexical origins.
A reflecting telescope in which light reflected from a convex secondary mirror passes through a hole in the primary mirror.
- ‘In an all-reflective Cassegrain telescope (usually called a Classical Cassegrain), there is no corrector lens.’
- ‘The tube length is very long compared to a Cassegrain telescope of the same effective focal length.’
- ‘Easy portability and precision optics are hallmarks of Cassegrain telescopes, and Orion has some of the finest.’
- ‘Visitors can also see the University Observatory, which houses a 14 inch Schmidt Cassegrain telescope with a cooled CCD (Charge Couple Device) camera.’
- ‘A correcting plate (a lens) was added in 1930 by the Estonian astronomer and lens-maker Bernard Schmidt, creating the Schmidt-Cassegrain telescope which minimized the spherical aberration of the Cassegrain telescope.’
Late 19th century: named after N. Cassegrain (1625–1712), the French astronomer who devised it.
We take a look at several popular, though confusing, punctuation marks.
From Afghanistan to Zimbabwe, discover surprising and intriguing language facts from around the globe.
The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.