For the first time in many years, a an old man traveled from his rural town to the city to attend a movie. After buying his ticket, he stopped at the concession stand to purchase some popcorn. Handing the attendant $1.50, he couldn't help but comment, "The last time I came to the movies, popcorn was only 15 cents."
"Well, sir," the attendant replied with a grin, "You're really going to enjoy yourself. We have sound now."
James Pollard EspyBorn 9 May 1785; died 24 Jan 1860 at age 74. American meteorologist who was one of the first to collect meteorological observations by telegraph. He gave apparently the first essentially correct explanation of the thermodynamics of cloud formation and growth. Every great atmospheric disturbance begins with a rising mass of heated, thus less dense air. While rising, the air mass dilates and cools. Then, as water vapour precipitates as clouds, latent heat is liberated so the dilation and rising continues until the moisture of the air forming the upward current is practically exhausted. The heavier air flows in beneath, and, finding a diminished pressure above it, rushes upward with constantly increasing violence. Water vapour precipitated during this atmospheric disturbance results in heavy rains.[Image: Formation of a thunderstorm, mature stage] |
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