Search History Explorer



History Explorer Results (115)
Related Books (7)
.
Results Per Page
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/10/2008
The ENIAC was a large, general-purpose digital computer built to compute ballistics tables for U.S. Army artillery during World War II. Occupying a room 30 feet by 50 feet, ENIAC—the Electrical Numerical Integrator and Computer—weighed 30 tons and used some 18,000 vacuum tubes. It could compu
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/6/2008
The Global Positioning System (GPS) consists of NAVSTAR satellites in earth orbit that send signals to receivers on land, sea, or in the air. The system became operational in 1978. Its military usefulness was demonstrated during Operation Desert Storm (1991), when coalition troops with receivers
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/5/2008
From the 1920s, psychologists have explored ways to automate teaching. In the 1950s, the psychologist B. F. Skinner of Harvard University suggested that techniques he had developed for training rats and pigeons might be adopted for teaching humans.
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/4/2008
After graduating from the University of Wisconsin, Charles W. Hart and Charles H. Parr developed a two-cylinder gasoline engine and set up their business in Charles City, Iowa. In 1903 the firm built fifteen tractors (a term coined by Hart and Parr), and the 14,000 pound #3 is the oldest survivin
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/4/2008
The John Deere Model D tractor was introduced in 1923 and became the first tractor built, marketed, and named John Deere. It replaced the Waterloo Boy in the company's product line.
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/4/2008
This telegraph register, manufactured in accord with the Morse patent, was installed in 1848 in South Bend, reputedly the first telegraph office in Indiana. Stamped on the base is "j. Burritt & son ithaca." Pulses of electricity caused the two vertical electromagnets (on the right) to pull ag
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
11/4/2008
This is a patent model of a sewing machine invented by John Bachelder of Boston, Mass., who was issued Patent No. 6439 on May 8, 1849. In his patent specification he claims "As my invention or improvement in the sewing machine is the combination, with the endless cloth-holder, of the curved bar o
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
10/27/2008
AbioCor Total Artificial Heart is the first electro-hydraulic heart implanted in a human. Approved by the United States Food and Drug Administration for clinical trails, the AbioCor was implanted in Robert Tools by cardiac surgeons Laman Gray and Robert Dowling on July 2, 2001, at Jewish Hospital
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
10/27/2008
This spur, worn over a riding boot, was made in Mexico in the mid-1800s. Rubbed against the animal's side, spurs are one of the instruments that riders use to direct horses. The spikes on this spur are set on a small wheel called a rowel, making this a rowel spur. Horses and good riding equipment
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
10/27/2008
Yorick is a plastic male skeleton imbedded with electronic and mechanical devices used to replace worn body parts. Yorick was created by Ed Mueller, an engineer in the Division of Mechanical and Material Sciences at the United States Food and Drug Administration (FDA), in Washington, D.C.
.
Results Per Page

Filter Resources By: