Evening Republican, Volume 21, Number 207, Rensselaer, Jasper County, 10 September 1918 — Keyless Electric Lock. [ARTICLE]

Keyless Electric Lock.

An interesting device is described by a Chicago electrician: “I have attached a secret .Jock that does not require any key to opep it to the door of my room,” he says. “The lock itself is an ordinary electric lock, but it is the way that the contact is. made through it in opening the door that makes my scheme different from others. A vertical wire is suspended the full length of the panel on the inside of the door. Directly opposite the middle of the wire and quite close to it, a small brass plate is mounted. One end of the battery-and-lock circuit is connected with the vertical wire, and the other end with the brass plate. Whenever I desire to enter my roam, I simply knock on the outside of the panel; the wire vibrates, it finally touches the plate, the circuit is closed, and the lock opens.”