compound reflector antenna
1telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …
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… …
3Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
4coleopteran — /koh lee op teuhr euhn, kol ee /, adj. 1. belonging or pertaining to the order Coleoptera. n. 2. a beetle. [1840 50; COLEOPTER(A) + AN] * * * ▪ insect Introduction any member of the insect order Coleoptera, consisting of the beetles and weevils …
5building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
6Optical fiber — A bundle of optical fibers A TOSLINK fiber optic audio c …
