achromatic edition
1Achromatic edition — Издание, отпечатанное в одну краску; Одноцветный оттиск …
2History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …
3Meade ETX telescope — A 105mm diameter Meade ETX The ETX (Everybody s Telescope) is a line of telescopes made by Meade Instruments. Contents 1 Origins …
4Condenser (microscope) — A condenser is one of the main components of the optical system of many transmitted light compound microscopes. A condenser is a lens that serves to concentrate light from the illumination source that is in turn focused through the object and… …
5Color theory — For the American electronica/synthpop musician, see Color Theory. In the visual arts, color theory is a body of practical guidance to color mixing and the visual impacts of specific color combinations. Although color theory principles first… …
6Eyepiece — For the device for looking through a camera, see viewfinder. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is… …
7On Vision and Colors — (German: Über das Sehn und die Farben) is a treatise[1] by Arthur Schopenhauer that was published in May 1816 when the author was 28 years old. Schopenhauer had extensively discussed with Johann Wolfgang von Goethe about the poet s Theory of… …
8Discovery of Neptune — New Berlin Observatory at Linden Street, where Neptune was discovered observationally. Neptune was mathematically predicted before it was directly observed. With a prediction by Urbain Le Verrier, telescopic observations confirming the existence… …
9Diamond clarity — Part of a series on Diamonds Material Material properties Crystallographic defects Formatio …
10Roger Joseph Boscovich — Infobox Scientist caption=Portrait by Robert Edge Pine, London, 1760. dead=dead birth date=birth date|1711|5|18 birth place = Dubrovnik, Republic of Ragusa death date=death date|1787|2|13 death place = Milan, Duchy of Milan residence = Milan… …
