Barron lock

Directory

References

Images

Figure 4: Barron tumbler lock, 1778

Discover

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

World Data Locator Map: Australia

Is Australia an Island?

Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

The Rise of the Machines: Pros and Cons of the Industrial Revolution

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Barron lock

Learn about this topic in these articles:

description

In lock: Development of modern types.
The Barron lock (see Figure 4) had two tumblers and the key had to raise each tumbler by a different amount before the bolts could be shot. This enormous advance in lock design remains the basic principle of all lever locks.
Read More