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Ballas got the idea for the trimmer while driving through an automatic car wash, where the rotating brushes gave him an idea. Using a tin can laced with fishing line and an edge trimmer, he tried out his idea, which worked. After some refinements, he shopped it around to several tool makers, who all rejected his invention.
In the 1930s, he discovered that electricity could be useful in confining animals when he made a triggering mechanism that made a car electrically active when a horse rubbed against it. By 1937, he had developed an electric fence for farmers, selling battery powered units [1] and being granted a patent. [2]
A "stun–lethal" fence may also consist of two fences; one set of wires forming a conventional pulsed DC non-lethal fence, the second set (interleaved with the first) forming a 6.6 kV AC lethal fence, energized when the DC fence detects an intruder. Alternatively it may consist of a single, AC or pulsed DC fence capable of running in "safe ...
Weed Eater is a string trimmer company founded in 1971 in Houston, Texas by George C. Ballas, Sr., the inventor of the device. The idea for the Weed Eater trimmer came to him from the spinning nylon bristles of an automatic car wash. He thought that he could come up with a similar technique to protect the bark on trees that he was trimming around.
Fences of wood, stranded cable, and pipe are used where cost is less of a consideration, particularly on horse farms, or in pens or corrals where livestock are likely to challenge the fence. Synthetic materials with wood-like qualities are also used, though they are the most expensive option in most situations.
The original non-shortable electric fence produced pulses of 2.5 kV. I believe most agricultural fences still use voltages around this value, but the current delivered can vary considerably. —Preceding unsigned comment added by 203.173.176.198 ( talk • contribs ) 11:50, 27 June 2007
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