Page:The American Cyclopædia (1879) Volume X.djvu/571

 LOCK LOCKE 565 fall into it, leaving the bolt free to move, or any other arrangement can be made which may be thought advantageous. There are a num- ber of excellent patents of combination locks in this country, some possessing advantages of one kind and some of another. In the simple form just described, represented in fig. 16, where the stump of the bolts passes direct- ly into the slot, there is danger of a burglar detecting its position by feeling while press- ing it against the periphery of the wheel, and thus dis- covering the com- bination. This is prevented by vari- ous devices. One of those used upon Hall's lock is shown in fig. 17. It con- sists in notching the fixed wheel, which is somewhat larger than the others, so that the stump shall be pressed against it or into its slots instead of against the other wheels. The latter also are not circular, but polygonal, so that on turning them inequalities are felt which cannot be distinguished from slots. The device employed in the "Dexter lock," used on the Herring safe, is shown in figs. 18, 19, and 20. A false wheel, a, fig. 18, smaller than the others, has a slot which receives an extra bar, c, fig. 20, shorter and placed beneath the common bar for the other wheels ; and also a shoulder, a, which prevents the "fence," #, fig. 20, from descending when the slot is not uppermost. Over this small wheel is a cam, 5, fig. 19, which FIG. 17. FIG. 20. contains in each corner an octagonal roller, upon which the piece d, fig. 20, rests when the fence is raised. This piece d is constantly pressed by spiral springs, by which means all possibility of ascertaining when the bar Ji is brought opposite a slot in a wheel, or opposite any depression, is prevented. The locking in this arrangement is performed by raising the " fence " until the notch e, fig. 20, is brought to embrace the pin g attached to the bolt/. When the fence is depressed the bolt may Fl<1 - 21 - FIG. 22. be moved backward or forward. In Sargent and Greenleaf's lock the bolt is composed of a roller, 5, fig. 21, in which there is a slot, c, into which the sliding bolt, a part of which is represented at tn^ may be passed when the slot is brought opposite. This can be done when the bar a passes into the slots in the wheels, by turning the dial knob. The parts are simplified in this drawing for convenience of illustration. Marvin's lock has a device shown in fig. '22. When the bar b falls into the com- mon slot, turning the knob draws the piece a out of the chamber, when the bolt may be slid into it. In the lock itself the piece a is behind and par- tially hidden by the wheels, but the one shown in the cut is made smaller than natural for conve- nience of illustration. Sargent and Greenleaf have lately patented a clock-work attachment to one of their locks, by means of which the bolt is liberated from a catch at a set hour, before which time nobody, not even the person possessing a knowledge of the com- bination, can enter the safe through the agency of the lock. LOCK, Matthew, an English composer, born in Exeter about 1635, died in London in 16Y7. He was a pupil of Edward Gibbons, organist of Exeter cathedral, and was brought into prom- inence by composing the music for the cere- monies attending the restoration of Charles II., in whose court he obtained the post of composer in ordinary. Though he wrote both for the opera and the church, he is chiefly known at the present day from having com- posed the incidental music to " Macbeth " and the " Tempest " which is still given when those plays are performed. He wrote also several musical treatises, which were controversial in their character and of little value. LOCKE, David Ross, an American satirist, born at Vestal, Broome co., N. Y., Sept. 20, 1833. He received a common school education, and learned the printer's trade in Cortland. After being connected with several western papers as a local reporter, he was successively editor and publisher in Ohio, from 1852 to 1860, of the Plymouth " Advertiser," Mansfield " Her- aid," Bucyrus " Journal," and Findlay " Jeffer- sonian." In the last named he published in 1860, under the signature of "Eev. Petroleum Vesuvious Nasby," a letter purporting to come from an ignorant and penniless Kentucky dem- ocrat, who was devoted to free whiskey and