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One of the largest Alertronics. These had 24 CJ46 horns, each driven by three 100 watt drivers. The total wattage is 7200 watts. They were configured with three rows of horns, each row having eight horns around. These sirens were used in the Oak Ridge, TN siren system, and are not known to be installed elsewhere. AL-1000/AL-2000 Electronic none ...
Maps of the New World had been produced since the 16th century. The history of cartography of the United States begins in the 18th century, after the declared independence of the original Thirteen Colonies on July 4, 1776, during the American Revolutionary War (1776–1783). Later, Samuel Augustus Mitchell published a map of the United States ...
Image:Blank US Map with borders.svg, a blank states maps with borders. Image:BlankMap-USA.png, a map with no borders and states separated by transparency. Image:US map - geographic.png, a geographical map. On Wikimedia Commons, a free online media resource: commons:Category:Maps of the United States, the category for all maps with subcategories.
Kelvite sounding machine. The Kelvite sounding machine was a small motor- or hand-operated windlass mounted on the deck of a ship. It was used to deploy and retrieve a wire sounding line to determine the depth of water in which the vessel was operating.
Under the auspices of the U.S. Marshals, 493 people, ranging from centenarian Old Sampson to 15-month-old Margarette, were to be sold from four plantations in Louisiana by auction at the St. Louis Exchange in New Orleans on Saturday, March 20, 1850 (The New Orleans Crescent, March 2, 1850, page 3); according to historian Damian Alan Pargas, there was a subsequent 1852 sale of property owned by ...
This is a route-map template for the Sounder commuter rail, a Seattle-area regional rail service.. For a key to symbols, see {{railway line legend}}.; For information on using this template, see Template:Routemap.
Telegraph Sounder. A telegraph sounder is an antique electromechanical device used as a receiver on electrical telegraph lines during the 19th century. It was invented by Alfred Vail after 1850 to replace the previous receiving device, the cumbersome Morse register [1] and was the first practical application of the electromagnet.
Hammond's Complete Map of Ohio, 1909. Hammond Map or Hammond World Atlas Corporation is an American map company. It was formerly an operating subsidiary of the Langenscheidt Publishing Group, a major map publisher in the United States, but was sold to Universal Map, an affiliate of Kappa Publishing Group, in 2010.