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Robertson was a Canadian. His 1908 invention was immediately a favourite
of carpenters, boatbuilders and automobile manufacturers. The main
reason was that, particularly in close quarters and awkward spaces, the
screw could be placed on the screwdriver and carried safely to its destination
without falling off.
<br>If your screwdriver doesn't work this way, you need a different size
bit. They come in several numbered and colour-coded sizes.
<br>Ford used the Robertson Screw for many years.
<p>From canadianhomeworkshop.com:
<blockquote><i>The legend goes like this: Sometime around the turn
of the century, Peter Lymburner Robertson was setting up a street booth
from which he planned to sell tools, when the slot-headed screwdriver
he was using slipped out of the screw head and slashed open his hand. "There
must be a better way," he mumbled to himself before vowing then and there,
the story goes, to create the ultimate driver. P. L. Robertson did
indeed patent his square-headed driver and screw system in 1908.</i><i></i>
<p><i>And not long after, the Fisher Body Company (famous for constructing
the Ford Model T) decided to use his invention in its production line.</i><i></i>
<p><i>Robertson's colour-coded screwdrivers—green, red and black from smallest
to largest-and square-headed screws have grown to dominate the Canadian
fastening market: Fully 85% of the screws sold in Canada use the Robertson
head.</i><i></i>
<p><i>About 10% of the screws sold in the U.S. are Robertson and This Old
House and New Yankee Workshop guru Norm Abram suggests they could
dominate the industry in 15 years.</i></blockquote>
Marianne King-Wilson
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