prototype drawing
41History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
42Polikarpov I-180 — infobox Aircraft name = I 180 type = Fighter manufacturer = Polikarpov caption = I 180 3 prototype designer = Nikolai Nikolaevich Polikarpov first flight = 15 December 1938 introduction = retired = status = Cancelled primary user = Soviet Air… …
43Messerschmitt P.1101 — P.1101 Model of P.1101 Role Fighter Manufacturer …
44Pen — For other uses, see Pen (disambiguation). A ballpoint pen A pen (Latin penna, feather) is a device used to apply ink to a surface, usually paper, for writing or drawing. Historically, reed pens, quill pens, and dip pens were used, with a …
45Dardick tround — The tround is a unique firearms cartridge developed by inventor David Dardick for use in his open chamber firearms. Named for its convex triangular shape, the tround allowed the firearm s chamber to be open on one side, removing the requirement… …
46Sediment Profile Imagery — (SPI) is an underwater technique for photographing the interface between the seabed and the overlying water. The technique is used to measure or estimate biological, chemical, and physical processes occurring in the first few centimetres of… …
47aerospace industry — Introduction assemblage of manufacturing concerns that deal with vehicular flight within and beyond the Earth s atmosphere. (The term aerospace is derived from the words aeronautics and spaceflight.) The aerospace industry is engaged in the …
48MUSIC — This article is arranged according to the following outline: introduction written sources of direct and circumstantial evidence the material relics and iconography notated sources oral tradition archives and important collections of jewish music… …
49SYNAGOGUE — This article is arranged according to the following outline. origins and history until the first century first century c.e. middle ages modern period …
50Yakovlev Yak-42 — Yak 42 Centre Avia Yak 42D in 2006 Role Airliner …
