Little Johnny is approached by the lifeguard at the public swimming pool.
"You're not allowed to pee in the pool," said the lifeguard. "I'm going to report you."
"But everyone pees in the pool," said Little Johnny.
"Maybe," said the lifeguard, "but not from the diving board!"
Screw machineIn 1798, the first U.S. patent for a nut and bolt machine was issued to inventor David Wilkinson of Rhode Island. His machine for cutting screw threads incorporated a slide-rest, with a heavy carriage supported on three rollers Afterwards, his machine was operated by water power at Pawtucket Falls, RI. Wilson was a machinist who also produced iron forgings and castings for the cotton industry industry there, such as Slater's Mill. Wilkinson later produced a large general purpose lathe (1806), a pioneering advance that founded the American machine tool industry. [The first machine of importance for trimming the heads of nuts and bolts was invented later by Micah Rugg, who was issued U.S. patent No. 2,766 on 31 Aug 1842.]« |
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