Explorer I-The first successful U.S. satellite
The first successful U.S. satellite, Explorer I, was launched into Earth orbit by the Army on Jan. 31, 1958, at Cape Canaveral, Florida, four months after Russia orbited Sputnik. The … Read More

The first successful U.S. satellite, Explorer I, was launched into Earth orbit by the Army on Jan. 31, 1958, at Cape Canaveral, Florida, four months after Russia orbited Sputnik. The … Read More
A chronograph is a timepiece capable of measuring discrete elapsed time units as well as telling time in a 12-hour format. In such a watch, each of these two separate … Read More
Altimeter: an apparatus used in aircraft for measuring altitudes. Ammeter: is used for to measure intensity of sound. Anemometer: is an instrument for measuring the force and velocity of wind. … Read More