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World Book Encyclopedia
1993
The physicist is using lasers (concentrated beams of light) in measuring airstream velocity
World Book Encyclopedia
1993
22 volumes
An American encyclopedia designed especially to meet the needs of elementary, junior high, and senior high school students.
While Encyclopedias have existed for over 2000 years, advancements in the printing press allowed significantly greater dissemination. Encyclopædia Britannica began in 1768, 43 years before the first Koenig press, and until the last 10-20 years was on of the most dominant scholarly information sources in the world.
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