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A diagram of a typical pointed nib Quill pen and ink bottle. A nib is the part of a quill, dip pen, fountain pen, ball point, or stylus which comes into contact with the writing surface in order to deposit ink. Different types of nibs vary in their purpose, shape and size, as well as the material from which they are made.
A Schmidt corrector plate is an aspheric lens which corrects the spherical aberration introduced by the spherical primary mirror of the Schmidt or Schmidt–Cassegrain telescope designs. It was invented by Bernhard Schmidt in 1931, [ 6 ] although it may have been independently invented by Finnish astronomer Yrjö Väisälä in 1924 (sometimes ...
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
Schmidt–Newtonian telescope from Meade. Schmidt–Newtonian telescopes offer images with less coma than Newtonian telescopes of the same focal ratio (usually about half). ). The corrector plate also helps to seal the tube assembly from air currents, and provides mounting point for the diagonal mirror, eliminating the diffraction effects from a "spider" secondary supp
Meghan Markle is expected to face the heat of scrutiny as she gears up to launch her Netflix lifestyle series "With Love, Meghan." The "Suits" alum made her social media comeback in January.
Eleven others have been arrested for the roles they played in the case, including the boat’s owner, Francis Buckheit, 64, and Alton Harrell, 35, both charged with rape, child endangerment, and ...
A man has been arrested after allegedly trying to smuggle cocaine worth $10,000 onto a flight under his wig, police say. The 40-year-old suspect, from Pereira, was attempting to board a flight ...
For the Schmidt–Pechan design, the upper prism from the Pechan design is replaced with a Schmidt roof prism, so the Schmidt–Pechan prism can both invert and revert the image and so act as an image rotator. The lower prism is known as a half-pentaprism or Bauernfeind prism. The image's handedness is not changed by the Schmidt–Pechan.
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