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historicalmarkerproject/markers/HM24QC_1911_Washington-DC.html
Kettering perfects a workable electric starter at his lab in Dayton. First installed in 1912 Cadillacs, it means the end of difficult and dangerous hand cranking; and enables more women to drive.
historicalmarkerproject/markers/HM24QB_transportation-corridor_Washington-DC.html
In the 1890s streetcars ran along M Street, a major east-west artery. Today cars, trucks and busses fill the street.
historicalmarkerproject/markers/HM24QA_1908_Washington-DC.html
Sperry develops a gyrostabilizer then gyrocompass, then the gyroscopic-guided automatic pilot, which keeps ships, airplanes, and now spacecraft on course.
historicalmarkerproject/markers/HM24Q9_single-bit-bollard_Washington-DC.html
Completed under the direction of George W. Goethals, the 51-mile Panama Canal opens to shipping in 1914 and shortens the voyage from New York to San Francisco by 7,873 miles.
historicalmarkerproject/markers/HM24Q8_1919_Washington-DC.html
Alexander Graham Bell and Casey Baldwin experiment on a boat that runs above water on wing-like structures called hydrofoils. Model HD-4 sets a water speed record of 70 mph.
historicalmarkerproject/markers/HM24Q7_1911_Washington-DC.html
Journalist Quimby becomes the first American woman to receive a pilot's license, and also the first woman to make a nighttime flight and fly the English Channel.
historicalmarkerproject/markers/HM24Q6_1900-1920_Washington-DC.html
1900
Americans own 8,000 cars but there are only 10 miles of concrete paved roads.
1920
Americans own 8 million cars. Roughly 10% or 369,000 miles of roads are surfaced
historicalmarkerproject/markers/HM24Q5_1923_Washington-DC.html
Morgan is granted the first US patent for a traffic signal to regulate vehicles and pedestrians in urban areas. The inexpensive, manually operated devise is used throughout North America.
historicalmarkerproject/markers/HM24Q4_1922_Washington-DC.html
William and Frank Fageol manufacture the Safety Coach, the first purpose-built bus, for inter-city travel. In 1927, their Twin Coach, the first dual-motored streetcar type urban transit bus, uses the whole length to carry passengers.
historicalmarkerproject/markers/HM24Q3_1926_Washington-DC.html
Among his many firsts, pioneer of space flight Robert Goddard constructs and launches the first liquid fuel rocket.