tag:blogger.com,1999:blog-3407624264627208128.post4431398051220829182..comments2024-01-26T21:38:25.924-08:00Comments on Duane's PoeTree: Jack Scott writesDuanesPoeTreehttp://www.blogger.com/profile/17053093400086634552noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-3407624264627208128.post-32626027056469644892017-06-24T11:15:04.204-07:002017-06-24T11:15:04.204-07:00Mazatlán comes from the Nahuatl for "Land of ...Mazatlán comes from the Nahuatl for "Land of deer." The city was founded in 1531 on the Pacific coast, across from the southernmost tip of the Baja California peninsula. Originally, the Presidio de Mazatlán was used as a reference for shipping to the port, known as the Islas de Mazatlán, but the presidio was renamed Villa de la Union in 1828 and the city took the name of the port. It served as the capital of the Mexican state of Sinaloa from 1859 to 1873, after the federal government passed a law that forbade state capitals to also act as ports. By the mid-19th century, a large group of immigrants had arrived from Germany, who developed it into a thriving commercial seaport, and their Bavarian folk tunes evolved into the local "banda" music. During the Mexican Revolution, Venustiano Carranza ordered a biplane to drop a crude bomb of nails and dynamite wrapped in leather on Neveria Hill, adjacent to the downtown area, but it landed on the city streets instead, killing two citizens and wounding others; it was thus the second city after Tripoli, Libya, to suffer aerial bombardment.<br />Christian Doppler was an Austrian mathematician and physicist who, in 1842, postulated that the observed frequency of a wave depends on the relative speed of the source and the observer, which he used to explain the color of binary stars. Three years later the Dutch chemist Christophorus Henricus Diedericus Buys Ballot (who also explained the direction of air flow in large weather systems and devised a tabular method for investigating periodicity in time series to determine the period of the sun's rotation) tested the Doppler effect for sound waves by using a group of musicians playing a calibrated note on a train, confirming that the sound's pitch was higher than the emitted frequency when the sound source approached him and lower than the emitted frequency when the sound source receded from him. In 1848 the French physicist Hippolyte Fizeau discovered the same phenomenon on electromagnetic waves and predicted the red and blue shifting of light waves. He also corrected many of Doppler's persistent errors and developed the formal mathematical theorem underlying the effect's principles. (In France, the effect is called the "effet Doppler-Fizeau.") During the Hungarian Revolution in 1848 Doppler fled to Vienna and taught science to Gregor Mendel.<br />DuanesPoeTreehttps://www.blogger.com/profile/17053093400086634552noreply@blogger.com