Day in Engineering History Archive - December 25
December 25
1741: The
Centigrade temperature scale was devised by astronomer Anders
Celsius. 1776: General George Washington and his troops crossed
the Delaware River for a
surprise attack against Hessian forces at Trenton, NJ. 1868:
Linus Yale, inventor and manufacturer of locks, including the
cylinder or pin-tumbler lock known by his name, died. 1988:
Ernst Ruska, an electrical engineer who invented the electron
microscope, was born. 1939: "A Christmas Carol," by Charles Dickens,
was read on CBS radio for the first time. 1966:
St. Elmo Brady, the first black man to earn a PhD in chemistry,
died. 1977: Silent films legend
Charlie Chaplin died.
1741: The
Centigrade temperature scale was devised by astronomer Anders
Celsius. 1776: General George Washington and his troops crossed
the Delaware River for a
surprise attack against Hessian forces at Trenton, NJ. 1868:
Linus Yale, inventor and manufacturer of locks, including the
cylinder or pin-tumbler lock known by his name, died. 1988:
Ernst Ruska, an electrical engineer who invented the electron
microscope, was born. 1939: "A Christmas Carol," by Charles Dickens,
was read on CBS radio for the first time. 1966:
St. Elmo Brady, the first black man to earn a PhD in chemistry,
died. 1977: Silent films legend
Charlie Chaplin died.| 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.