BRAIN TEASERS
Brain Teasers User Profile

Michael Spivak

rank
520
points
0
See full ranking list
short ranking list
518. Cindy Stclair 0
519. Hayley Martin 0
520. Michael Spivak 0
521. Rachel Parker 0
522. Eric Willems 0
last 3 solved tasks

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.«

Ponderings Collection 09


Why call then hot water heaters if the water is already hot?
If you throw a cat out a car window does it become kitty litter?
If corn oil comes from corn, where does baby oil come from?
If there is no God, who pops up the next Kleenex in the box?
When a cow laughs does milk come up its nose?
Why do they put braille on the number pads of drive-through bank machines?
How did a fool and his money GET together?
If nothing sticks to Teflon, how do they stick Teflon on the pan?
How do they get a deer to cross at that yellow road sign?
If it's tourist season, why can't we shoot them?
Jokes of the day - Daily updated jokes. New jokes every day.
Follow Brain Teasers on social networks
This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.