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Find the value of the next number

Look at the series (325, 446, 567, 688, 709, ...), determine the pattern, and find the value of the next number.

Correct answers: 160

The first user who solved this task is Vladimir Krnac.

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What do you do when 50 zombies...

What do you do when 50 zombies surround your house?
- Hope it's Halloween.

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Electric motor

In 1904, the first direct current, interpole, electric motor to be patented in the U.S. was issued to Mathias Pfatischer of Phildadelphia, Pennsylvania under the title "Variable Speed Motor" (No.775,310). His improvement was to "effect commutation without sparking, with a variable load as well as at variable speed and which is capable of rotation in either direction." The new design added auxiliary-field pole-pieces which were small as compared to the main pole-pieces.«

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