• Photo of Lemon House, Level #6, and Engine House on a beautiful summer day.

    Allegheny Portage Railroad

    National Historic Site Pennsylvania

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  • Road Closure

    Please be aware that part of the public area loop has been closed until further notice as the park starts preparatory efforts for this summer's paving project on the Picnic Area Road.

Invention Timelines

The Allegheny Portage Railroad operated from 1834 to 1854. There were many changes that occured during those twenty years. Here is a list of some interesting inventions and cultural happenings of the period.

1834
Braille, a system of raised print for the blind, is developed by French teacher Louis Braille.

1835
Charles Darwin visits the Galapos Islands.
French chemist C.S.A. Thilarier creates dry ice.

1836
By use of a microscope, yeast is found to be a living organism.
Emerson publishes his first book, Nature.

1837
Samuel Colt develops the Colt 6-shooter revolver.
Samuel Morse develops a magnetic telegraph and Morse Code.

1838
British physicist Michael Faraday discovers a phosphoresent glow produced by electric discharge in a low-pressure gas.

1839
French inventor Louis Daguerre introduces a commercially viable photographic process.
The first full fledged bicycle is made in Scotland.

1840
German-Swiss chemist Christian Schonbein discovers ozone.

1841
Scottish missionary David Livingstone is the first Westerner to explore the Kalahari Desert.
Dorothea Dix begins campaign to reform care of mentally ill and poor.

1842
Austrian physicist Christian Doppler discovers the Doppler Effect.

1843
US shop apprentice Elias Howe, Jr, invents the interlocking stitch sewing machine.

1844
Henry Wells begins an express delivery company- eventually Wells, Fargo, and Company.
Dickens publishes A Christmas Carol.

1845
American dentist Claudius Ash originated the single porcelain tooth.

1846
First sighting of planet Neptune.
Edward Lear publishes Book of Nonsense, limericks for children.

1847
Italian chemist Ascanion Sobrero first produces the explosive nitroglycerin.
Ebenezer Butterick invents process for cutting dressmaker patterns.

1848
William Thomson, Lord Kelvin, creates the Kelvin temperature scale.
Hungarian composer Franz Liszt

1849
Elizabeth Blackwell, America’s first female physician graduates from Geneva College of Medicine, NY
The safety pin is patented by Walter Hunt.

1850
Epidemiology, the study of causes, distribution, and control of disease becomes a branch of medical science.
EB Browning publishes Songs from the Portuguese.
Nathanial Hawthorne publishes The Scarlet Letter.

1851
German surgeon Helmholtz invents the ophthalmoscope to examine the interior of the eye.
The NY Times is first published.

1852
French physicist Jean Foucault invents the gyroscope.
Otis patents the elevator.
1853
British George Cayley flies the first successful manned glider.
Swedish Lundstrom patents the safety match.
Steinway pianos begin production.

1854
Florence Nightingale founds modern nursing in Constantinople administering to sick and injured Crimean War soldiers.
Tennyson’s “Charge of the Light Brigade” is published.
Thoreau’s Walden is published.

 

Inventions and changes continue, of course. Here's just a sampling of what has happened in the twenty years between 2008 and 1988.

2008
personal genome tests
Apple app store

2007
iPhone launched.

2006
The blu-ray is first announced and introduced.

2005
YouTube - the online video sharing and viewing community - was invented

2004
Google announces Gmail on April 1, 2004.

2003
The hybrid car goes on sale.
iTunes store introduced.
MySpace is founded.

2002
NASA invents the Mars Rovers
Listerine PocketPaks, tissue-thin strips that melt in your mouth for breath-freshening, go on sale.

2001
Open content encyclopedia: Wikipedia is started.
Bill Gates unveils the Xbox gaming console
Apple introduces the iPod.

2000
Flash memory data storage device: USB flash drive debuts

1999
American college student Shawn Fanning invents Napster

1998
Google founded
Internet weblogs begin to appear.
PayPal is instituted.

1997
The Dancing Baby, one of the earliest Web fads, is viewed by many.
The first cloned sheep - Dolly – is born.
AltaVista introduces its free online translator Babel Fish.

1996
Web TV invented.
For the first time more e-mail is sent than postal mail in USA.

1995
DVD (Digital Versatile Disc or Digital Video Disc) invented.
Hotmail is started.
EBay is founded.

1994
Bluetooth was invented
Yahoo is founded

1993
Pentium computer processor is invented.
President Bill Clinton puts the United States White House online with a World Wide Web page and E-mail address for the President, Vice President and first lady.

1992
DNA fingerprinting for criminals developed.
Johnny Carson retires from the Tonight Show.

1991
Magellan space probe maps 90% of Venus
The digital answering machine invented.
The World Wide Web is launched to the public

1990
Portable personal computers become available.
Hubble Space Telescope is launched.

1989
Exxon Valdez spills 10.8 million US gallons of crude oil in Alaskan waters.
Vinyl records phased out of music stores.
High-definition television invented.

1988
Digital cellular phones invented.
Doppler radar invented

Did You Know?

East Entrance Staple Bend Tunnel

In 1824 an all-water route through the Allegheny Mountains was proposed. A 4 mile tunnel "like a well dug horizontially" would be needed, along with ventilation shafts and support features. A portage over the mountains was built instead.