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Day in Engineering History Archive - April 22

| Jan | Feb | Mar | Apr | May | Jun |
| Jul | Aug | Sep | Oct | Nov | Dec |

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in this article, there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative sources. On RF Cafe, events with hyperlinks have been verified.
Please submit significant historical events and dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death date ;-)
A couple years ago, I began commemorating the birthdays of notable people and events with special RF Cafe logos. Where available, I like to use images from postage stamps from the country where the person or event occurred.

April 22

Happy Birthday Robert Oppenheimer! - Please click here to visit RF Cafe.

1823: Roller skates (inline at that) were patented by Robert Tyers, a fruiter in Piccadilly, London. 1856: The first railroad train crossed the first railroad bridge over the Mississippi, between Rock Island, IL, and Davenport. 1864: Congress authorized the use of the phrase "In God We Trust" on U.S. coins. 1904: Robert Oppenheimer, the "Father" of the nuclear bomb, was born. 1914: Babe Ruth made his pitching debut with the Baltimore Orioles. 1924: A patent for a laminated padlock was issued to Harry  Soref, who later founded Master Locks. 1933: Sir Henry Royce, half of the Rolls Royce team that builds automobiles and airplane engines, died. 1952: An atomic test conducted in Nevada became the first nuclear explosion shown on live network television. 1972: Apollo 16 astronauts John Young and Charles Duke walked and rode in the Lunar Rover on the surface of the moon for seven hours, 23 minutes. 1991: Intel released the 80486SX microprocessor.


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