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(1) The device is only 10-1/2" long. To use it in the
manner of a normal breast drill, with the device vertical, would
mean the user might have a flat spot on his or her forehead.
There is also no provision for a handle, so one would be gripping
the metal frame with one hand and flinging the other to operate
the lignum vitae driving pulley with the attached ebony pull
handle. In such close quarters, I am sure there would be much
muttering and many skinned knuckles. So it seems reasonable
that one might use the device in the horizontal mode, doing
whatever it does into a fixed vertical workpiece.
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| Patent
mark. |
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Maker's
mark. |
(2) When in doubt, dazzle them with facts. Marked so well
as to be confusing, there are no less than four clues as to
its origin and use: The "Glasgow"; Patent #12691 -07;
trademark "Gyro"; "McG.S Ltd." All these
fine bits of information proved useless following normal search
procedures. Gaining access to the British patent papers is not
easy, as most are not available unless one does a true physical
search which, in some cases, involves going from one building
to another to complete the task.
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Chain mechanism. |
(3)
Pulling the chain causes the tool holder to rotate and the spring
retracts the chain back onto the spool for another go at the
task. Presumably, this gives equal force "coming and going"
at the working end of the shaft. This spool is not freewheeling.
There is a tendency for this chain to bunch all in one spot,
preventing smooth retraction. It is thought that the cogs at
the top of the spool are there to immobilize the shaft when
changing or disassembling the lower section, perhaps for attaching
a different end piece, changing the bit or replacing the spring.
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