Find number abc
If 1aa66 + caacc = baa21 find number abc. Multiple solutions may exist.Correct answers: 28
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Fire extinguisherIn 1863, the first U.S. patent on a fire extinguishing system for buildings was granted to Alanson Crane of Fortress Monroe, Va. (No. 37,610). The patent drawing [left] shows a longitudinal vertical section of a building, which could be with one or more stories, as a dwelling, storehouse or any other purpose. It shows a water pipe under the foundation of the outside wall, which supplies a vertical pipe leading up the inside of the wall to one or more perforated pipes extending horizontally throughout the building. The principle innovation was to include a stop cock with a locking cover that could be operated outside the wall by an authorized person in the event of a fire when the building is unoccupied. Thus water could flood the floors and quickly extinguish a fire. |