manually-operated telephone system
51Railway signalling — Not to be confused with Railway signal. A gantry of British semaphore signals seen from the cab of a steam locomotive Railway signalling is a system used to control railway traffic safely, essentially to prevent trains from colliding. Being… …
52Wikipedia:Reference desk/Computing — The Wikipedia Reference Desk covering the topic of computing. Computing #eee #f5f5f5 #eee #aaa #aaa #aaa #00f #36b #000 #00f computing Wikipedia:Reference de …
53Signals intelligence operational platforms by nation — This article is a subset article under the main article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with current signals… …
54Railways in Melbourne — Melbourne rail network  City Loop  Caulfield group  Frankston line  Pakenham line  Sandringham line  Cranbourne line …
55Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
56Glossary of firefighting equipment — Note: This list is incomplete. You can help Wikipedia by [http://en.wikipedia.org/w/index.php?title=Glossary of firefighting equipment action=edit adding to it] . 0 9 * 1 3/4 inch hose: see attack hose * 2 1/2 inch hose: see attack hose , supply… …
57Augmentative and alternative communication — An AAC user indicates a series of numbers on an eye gaze communication board in order to convey a word. Augmentative an …
58Appropriate technology — (AT) is technology that is designed with special consideration to the environmental, ethical, cultural, social and economical aspects of the community it is intended for. With these goals in mind, AT typically requires fewer resources, is easier… …
59motion-picture technology — Introduction the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… …
60photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
