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The district includes 80 Prairie School concrete residences built in 1916–17. The homes served as housing for employees of the American Steel and Wire Company . Poured-in-place concrete houses had become popular in large-scale housing developments at the time, partly thanks to promotion by Thomas Edison ; the homes built in Donora used a ...
Concrete carbonation can be visually revealed by applying a phenolphthalein solution over the fresh surface of a concrete samples (concrete core, prism, freshly fractured bar). Phenolphthalein is a pH indicator , whose color turns from colorless at pH < 8.5 to pink-fuchsia at pH > 9.5.
Concrete City stands to this day, albeit in extreme disrepair. Demolition plans by the state were scrapped due to the cost of a potential operation. The ghost town is commonly used by military, police, firefighters, [ 5 ] airsoft military-simulation events, [ 6 ] recreational paintball players for staged games, and as a popular site for urban ...
The Casa Grande Photogrammetric Test Range is a test range established in the mid-1960s to test the dynamic performance of aerial survey cameras. [1] The range consisted of 272 concrete calibration markers embedded into the Earth's surface in and around Casa Grande, Arizona , United States. [ 2 ]
A historical marker at Front and South streets in Philadelphia, where the survey began. Maryland's charter of 1632 granted Cecil Calvert land north of the entire length of the Potomac River up to the 40th parallel. [3] A problem arose when Charles II granted a charter for Pennsylvania in 1681. The grant defined Pennsylvania's southern border as ...
Unintended shootings drop, but children more often the victims. Unintentional shootings are the smallest category of gun deaths, making up about 1% of the total, and have been dropping for four ...
Ferroxyl indicator, or rust indicator, is a solution containing potassium hexacyanoferrate(III), phenolphthalein and sodium chloride. It turns blue in the presence of Fe 2+ ions, and pink in the presence of hydroxide (OH-) ions. It can be used to detect metal oxidation, and is often used to detect rusting in various situations.
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