- Daniel Webster (January 18, 1782 – October 24, 1852) was an American lawyer and statesman who represented New Hampshire and Massachusetts in the U.S. Congress and served as the 14th and 19th U.S. Secretary of State under Presidents William Henry Harrison, John Tyler, and Millard Fillmore. Webster was one of the most prominent American lawyers of the 19th century, arguing over 200 cases before the United States Supreme Court in his career. During his life, Webster had been a member of the Federalist Party, the National Republican Party, and the Whig Party. He was among the three members of the Great Triumvirate along with Henry Clay and John C. Calhoun.
- Focal length (Wikipedia)
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system’s optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system’s optical power.
- Daniel Webster was born on January 18, 1782, in Salisbury, New Hampshire, at a location within the present-day city of Franklin.
- In September 1852, Webster returned to his Marshfield estate, where his health continued to decline due to cirrhosis and a subdural hematoma. He died in Marshfield, Massachusetts on October 24, 1852, at the age of 70, and is buried in Winslow Cemetery near his estate. His last words were, “I still live.”