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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.
A strand of electric fence may also keep horses from pushing on a mesh fence. Mesh fencing needs to be heavy-gauge wire, woven, not welded, and the squares of the mesh should be too small for a horse to put a foot through. "Field fence" or "no-climb" fence are safer designs than more widely woven "sheep fence."
In areas where such a tall fence is unsuitable (for example, on mountains subject to very high winds), deer may be excluded (or contained) by a fence of ordinary height (about 1.5 metres [4 feet 11 inches]), with a smaller one of about 1 metre (3 feet 3 inches) high, about 1 metre (3 feet 3 inches) away from it, on the same side as the deer.