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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
endulum timepiece; it makes a complete revolution in one week, and carries a glazed paper which has been smoked black by means of a candle. At the extremity of the lever is a very fine spring, pointed at the end, which rests upon the cylinder and traces a white line upon the black ground. At the end of each week the paper is changed for a fresh one, the record on the old one being protected by a coat of varnish. The action of the self-registering and printing barometer, invented by Professor Hough of the Albany Observatory, depends upon the making and breaking of an electric circuit by the rising and falling of the mercury, for the communication of impulses to electro-magnets, which unlock a train of clockwork so devised as not only to describe a constant curve upon a piece of paper, representing the hight French Barometrograph. of the column at any time of day and night for many days in succession, but also to print upon pages, which may be subsequently bound, the hights of
Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
, from target to target, each of which, as we have said, is connected with a separate apparatus. In this way both the space and the time employed in going over it being determined, the velocity, which is the ratio of time to space, is determined also to a fraction of one two-thousandth of a second. Since 1848, the idea of recording astronomical observations by galvanic electricity has been put in successful operation by several individuals; Professor Hilgard of the coast survey, and Professor Hough of the Dudley Observatory, among the num- ber. The chronograph of the latter prints with type the time of an observation. The professor thus describes it in brief. The plan is based upon the principle of using separate systems of mechanism for the fast moving type-wheel, and those recording the integer minutes and seconds, regulating each with electro-magnets controlled by the standard clock. I. A system of clock-work carrying a type-wheel with fifty numbers on its rim, revolving