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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (6, 9, 11, 18, 21, 23, 64, 67, 69, 72, 97) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A-B+C.

Correct answers: 1

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Electric race-track amusement patent

In 1899, black American inventor, Granville T. Woods was issued a U.S. patent for an "Amusement Apparatus" (No. 639,692). Woods, as the most prolific African-American inventor of the late 19th and early 20th centuries, has been called the black Edison. His numerous inventions included a steam-boiler furnace, telephone, telegraph system, electric railway and automatic air brake for railroad safety. This patent design was for small scale or large scale electrically-driven cars on a closed track, such as a figure-8 layout . If carrying persons, Woods claimed that it was suitable for amusement "use at summer and other resorts, at fairs, &c., and in or out of doors." The track could cross at different levels, or on the same level.«

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