Pendulum-Scale. (open access)

Pendulum-Scale.

Patent for "a self-registering scale which shall be composed of but a few parts, and which will be accurate and reliable in use, and not liable to get out of repair from constant employment" (lines 10-14).
Date: April 17, 1894
Creator: Graves, William J.
System: The Portal to Texas History
Permutation Lock. (open access)

Permutation Lock.

Patent for a new and improved combination lock. This design's operation "is as follows: Being unlocked, the bolt is in the retracted position . . . [t]he door can then be operated in the usual manner, being held, when closed, by the ordinary spring-bolt. . . . When the door is closed, in order to lock it, the graduated knob is turned, operating the toothed disk and the first or governing ring, which will . . . throw out the end of the locking-bolt. By turning the handle, all the rings of the slotted guide can be moved sufficiently to engage the teeth of the locking-arm of the bolt" (lines 80-94).
Date: April 17, 1883
Creator: Sarlls, Rutus & Holland, Virgil C.
System: The Portal to Texas History