Domestic Encyclopædia (1802)/Supplement/Lock

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LOCK.—In June, 1801, a patent was granted to Mr. Holemberg, for his invention of locks or fastenings adapted for general use, on a new and improved construction.—The external form of the locks, thus manufactured, corresponds with those in common use: internally, however, an orbicular bolt is substituted for a rectilineal one, the security of which is increased by an inside tumbler that is fastened by a flat spring bolt. The whole manufacture of this lock is remarkable for its simplicity and ingenuity, with which it combines the important advantage of security; so that this contrivance justly merits the preference.