combination lock

Directory

References

Images

Figure 6: Combination safe lock The lock cannot be opened until the slots on the three wheels are in line; movement of the dial is transmitted to each wheel by a system of pins (in practice much shorter than shown), arms, and studs

Discover

Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

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

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

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

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

combination lock

device

Learn about this topic in these articles:

invention by Yale

In Linus Yale
…1862 he had introduced the combination lock.
Read More

locks

In lock: Development of modern types.
The keyless combination (see Figure 6) lock derives from the “letter-lock,” in use in England at the beginning of the 17th century. In it a number of rings (inscribed with letters or numbers) are threaded on a spindle; when the rings are turned so that a particular…
Read More