Design, Construction & Operating Principles of
ELECTROMAGNETS
for Attracting Copper, Aluminum and ther Non-Ferrous Metals

by Leonard R Crow

Wind a coil of wire around a cylinder, and you get an electromagnet called a solenoid that will attract iron and steel. But it certainly won't attract copper and aluminum.

A favorite trick for generations of electrical experimenters has been to power a solenoid with AC and use it to "fire" aluminum washers across the room. It's the old electric cannon trick.

Here, a toroidal coil with an additional core powered by AC will attract aluminum. It's kind of the opposite of the electric cannon.

This reprint of the 1951 original will explain how this unusual electromagnet works, and why it attracts copper, aluminum and similar metals with low electric resistivity.

The author explains: "Back in 1935 I gave a public lecture demonstration at the physics department of Illinois University in which I used an electrical training aid of my own design and construction to show that an electromagnet could be used to attract non ferromagnetic metals of good electrical conductivity.

In the following five years I devoted much thought, time and effort to making various types, styles and sizes...

Following is a description of, and basic fundamental operating principles pertaining to the type of electromagnet that I have found most effective for the attraction of non ferrous-metals."

Small book, but loaded with unusual information. A clever design that you could use to suck the siding off your neighbor's house, or that can of beer right out of his hand! Get a copy. 5 1/2 x 8 1/2 booklet 38 pages

No. 3092 ... $11.95