ATDDTA(10) Two-Dollar Ingersoll [270:8-9]

[Keith]

My first lead ended up being a dud:
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Simon Ingersoll was the inventor of the first pneumatic drill for use  
in mining excavation.

Ingersoll's design also featured an innovative tripod, and was  
significantly lighter than other drills.

http://www.invent.org/hall_of_fame/281.html

"On March 7, 1871 Ingersoll received his basic rock drill patent.   
There had been earlier drills, designed for mining and tunneling and  
mounted on carriages.  Ingersoll mounted his drill on a tripod  
equipped with leg weights to hold it steady."
http://tinyurl.com/3aenuc

http://constructmyfuture.com/hall-people.html

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The Ingersoll in question is rather a pocket watch being used as a  
timing mechanism:

"One company is famous for the first genuine Dollar watch -  
Ingersoll. They produced the first Dollar Ingersoll Watch in 1881 via  
a New York based mail-order business set up by brothers Robert &  
Charles Ingersoll."

http://www.antique-pocket-watch.com/ingersoll-watch.html

http://en.wikipedia.org/wiki/Dollar_watch

Perhaps the extra dollar for ATD's Ingersoll is the cost of  
converting a pocket watch into a timing mechanism.