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"The writing is clicking away in my head and piling up, and unless I get it on paper somehow it's going to create uncomfortable pressure in my skull."
- Isaac Asimov

Hyperbolic Solenoid  
  Device that creates and manipulates magnetic fields.  

The cops pounced on a bulge in Methuen's pocket. The bulge was made by another wire contraption. Methuen shrugged. "My hyperbolic solenoid. Gives you a conical magnet field and enables you to manipulate ferrous objects at a distance. I picked the lock of the doors to the elevator with it."
From The Exhalted, by L. Sprague de Camp.
Published by Astounding Science-Fiction in 1940
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