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Sigs
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- Simplified inertial guidance system
- Stellar-inertial guidance system
- Solomon islands geological survey
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Simplified inertial guidance system, английский
Упрощенная инерциальная система наведения
Stellar-inertial guidance system, английский
Астроинерциальная система наведения
Solomon islands geological survey, английский
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Geological, английский
Геологический
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Signals, английский
- Codes of signals have been used for centuries and changed frequently. their use is too well known to need explanation. they are conveyed by flags, semaphores, balls, guns, lights, rockets, bells, horns, whistles, &c., and half a century since were carried on with incredible ability. it may be also observed that signal officers of those days became subsequently the elite of the navy; signal-officer being then a proud term of distinction.—fog-signals, certain operations which emit sound.—night-signals, either lanterns disposed in certain figures, flashes, or false fires, &c.
- Visual indication passed to a train driver to advise the speed, direction or route of the train. there are almost as many types of signals as there are railways but they fall into the following main categories:
Signal, английский
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