Scientific American Volume 21 Number 20 (November 1869) . pthsand in positions which render them inaccessible. Carbonicacid, known to the miners as choke-damp, is produced when carbon is burned with a sufficient amount ol air or ??» mThe Crown Prince of Prussia is said to have invented a new apparatus for the manufacture of vinegar. © 1869 SCIENTIFIC AMERICAN, INC November 13, 1869.] M&Mit %mtxta% 309 THE VEL0CIMETEE--A NEW AID IN MECHANICS. Modern machinists have long recognized the importance ofknowing, as precisely as possible, what a machine is doing,while in motion, without waiti
Scientific American Volume 21 Number 20 (November 1869) . pthsand in positions which render them inaccessible. Carbonicacid, known to the miners as choke-damp, is produced when carbon is burned with a sufficient amount ol air or ??» mThe Crown Prince of Prussia is said to have invented a new apparatus for the manufacture of vinegar. © 1869 SCIENTIFIC AMERICAN, INC November 13, 1869.] M&Mit %mtxta% 309 THE VEL0CIMETEE--A NEW AID IN MECHANICS. Modern machinists have long recognized the importance ofknowing, as precisely as possible, what a machine is doing,while in motion, without waiting for ultimate results. Theengineer must have his steam gage to inform him at alltimes the quantity of operative pressure in the boiler, andthe applications of the dynamometer are made with the soleview to determine the motive power of machinery at thetime of application. Various contrivances have come into use for indicating thespeed, that is to say, the number of revolutions performedwithin a given time, in the running of machinery. But a1!. hitherto employed may be resolved into mere counters ofrevolutions. A time-piece must be consulted both at the be-ginning and conclusion of,the counting process, or nothing isascertained as to the running rate. Prior to the inventionwhich we are about to explain to our readers, nothing wasever patented in this country which proposed to indicate ofitself, at all times, the running rate of machinery while inmotion, so that, whenever glanced at, it would inform theobserver how fast the machine was then running. The invention referred to was patented through the Scien-tific American Patent Agency Nov. 26,1867, to Mr. Edward , of St. Charles, Mo. It is about the size of an ordinaryclock—it may be larger or smaller, according to taste—andmay be connected with any running machinery either by im-mediate contact or in a remote part of the buildings has two dials, placed similarly to those on calendar clocks ;one an ordina
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