The transmission accelerated each rotation of a brace at a ratio
of 1 to 5 allowing more rapid rotation of a bit in the
I have assembled a research
collection of patented bitstocks and bitstock tools over the
past 50 years and in the early years found some rare ones before
they were known to be rare.
I have seen lots of bitstock tools
over the years and have been tied into the collector market
since circa 1970, where I was able to find lots of bitstock
tools. I have come to the conclusion that just about every tool
in the patent records was actually manufactured, albeit in a
very limited quantity.
The tool in the first photo is a
geared transmission that was used in drilling, much like an
eggbeater drill. The transmission accelerated each rotation of a
brace at a ratio of 1 to 5 allowing more rapid rotation of a bit
in the transmission chuck.
This tool required an assistant to hold the
tool while another cranked the brace.
This device was patented on March
18, 1873 by G. Gibbs. It is marked, MILLERS FALLS" on the chuck.
In all my years of searching, this is the only specimen of this
tool I have ever seen.
It is marked with the patent date.
The Chuck is marked, MILLERS FALLS.