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Cameras with focal-plane shutters—even if they had PC connectors with X, F, M, or S-sync delays ("xenon sync" with zero delay and flashbulbs with peak delays of 5, 20, and 30 ms)—could not be used at speeds that attenuated guide numbers with most types of flashbulbs because their light curves were characterized by rapid rise and fall rates; the second shutter curtain would begin wiping ...
However, horse-drawn vehicles had been designed for relatively slow speeds, and their suspension was not well suited to the higher speeds permitted by the internal combustion engine. The first workable spring-suspension required advanced metallurgical knowledge and skill, and only became possible with the advent of industrialisation .
Just before the piston reaches TDC, ignition begins. In the case of a SI engine, the spark plug receives a high voltage pulse that generates the spark which gives it its name and ignites the charge. In the case of a CI engine, the fuel injector quickly injects fuel into the combustion chamber as a spray; the fuel ignites due to the high ...
Chess composition is the art of creating chess problems (also called chess compositions). The creator is known as a chess composer. [165] There are many types of chess problems; the two most important are: Directmates: White to move and checkmate Black within a specified number of moves, against any defense.
The results of a search for the term "lunar eclipse" in a web-based image search engine. A web search engine or Internet search engine is a software system that is designed to carry out web search (Internet search), which means to search the World Wide Web in a systematic way for particular information specified in a web search query.
North Korea requests the building of the light-water reactors promised in the Agreed Framework, but the U.S. refuses, prompting warnings of a "standoff" between the parties. 19 September : In what is initially hailed as an historic joint statement, North Korea agrees to give up all its nuclear activities and rejoin the nuclear Non-Proliferation ...