Symbols of U.S. Government:
Cast in London, England in 1752, the Liberty Bell rang when the Continental Congress signed the Declaration of Independence and has become the symbol of freedom in the United States. The bell weighs about 2000 pounds and is made mostly of copper (70%) and tin (25%).
Made for the Pennsylvania State House (now Independence Hall), the Liberty Bell was ordered by the Pennsylvania Assembly in 1751 to commemorate the 50-year anniversary of William Penn's 1701 Charter of Privileges. Shortly after its arrival in Philadelphia the Bell cracked. Local craftsmen recast the bell using the metal from the old bell, but this one also proved defective. A third was cast by John Pass and John Stowe. Their names appear on the bell, along with the city and date, along with this inscription:
NOTE: The spelling of "Pennsylvania" was not at that time universally adopted. Pensylvania was an accepted alternative spelling throughout the 1700's.
On June 7, 1753, the bell was hung in the tower of Independence Hall; however, during the American Revolution, in 1777, British troops captured Philadelphia. For safekeeping, the bell was moved to Zion's Reformed Church in Allentown, Pennsylvania. It was returned to Philadelphia in 1778.
As tradition, the bell was rung on every July 4th and on every state occasion until 1846. Not everyone agrees on when the first crack appeared on the Liberty Bell, but by 1846 a thin crack began to affect the sound of the bell. It was repaired so the bell could be tolled for Washington's birthday on February 23, 1846. In order to repair the bell, a slot was carved along the length of the crack that prevented the two sides of the bell from vibrating against each other. Two rivets were inserted in this slot to control the vibration of the two sides and restored the bell's tonal quality.
Today, the Liberty Bell hangs in Philadelphia at the Liberty Bell Pavilion on Market Street for all to see and is still gently rung each July 4th.
To learn more, check out the National Park Service's Liberty Bell.