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W1712 TO SAMUEL A. DUNCAN from William Dunn
Jan 30 1885
To:
From:

Sam Duncan1

Another idea or form of the first idea has developed itself and it my show you my idea. I am well pleased with Mr G. & his attention.

There are a number of wedges pins with a square either as a hole or protruberance [sic], but it is always at the head end and not at the pivot end, nor made expressly & necessary for the lifting of the pin or wedge when could be done about as well by round as square parts, whilst in using my plan round make would cause me to incur a good deal more expense. Now what I claim is the two round ends of the (crank) shaft (of the crank), that the inside one next the (handle of the) crank (shaft) is largest of all, then comes the flatted sides part a little smaller so the Hook-Bar can as to fit up to the round part as a [shin??] then the outside round part smaller to allow a new hook or Hook-Bar to be put in over it into the flatted surfaces; without inquiry the berring surface this can all be done on the road in a few minutes time without going to any shop for help if this will carry an extra Hook-Bar thus causing but a few minutes delay in the road.

In using the word Hook-Bar I want to cover not only the present weighted head hook, but any form of hook or bar or pin or wedge, that can be used to raise pin &c. &c. from the pivot end.

Another word is crank or Crank-Shaft--the shaft part acts as a (pin) both to restrain the Hook-Bar in place-then the handle of the shaft is what is used in (raising [retaking??]) or lifting the Hook-Bar.

This being my first attempt I must learn the minutia or else always depend on someone for every little thing.

[William Dunn]


1 Samuel A. Duncan is likely a patent attorney hired by Dunn after he rejected Calvin Brooks McQuesten's choice for the job. Among other devices, Dunn had patented a train car coupler and in 1884 it appears that he found some way to improve it and wanted to patent the improvement. See W1707, W1711, W2656, W2667, W1532, W2671, W2675, W1714, W1716, W1721, W1741and footnotes for more information on this patent; see W2554a for more about Dunn and his business with the McQuestens.




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Copyright 2002 Whitehern Historic House and Garden
The development of this website was directed by Mary Anderson, Ph.D. and Janelle Baldwin, M.A.
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