"I see your point but the USN was only one customer who used the gauge. Other users of the same gauge, perhaps a railroad or steamship, utility or manufacturer might have other issues that required added inventions (& pat.nos.).
"none of the images seem to correlate. the # on the gauge face must not have anything to do with a patent if all three are different on the same type of gauges ????? the whole configuration had one very specific use which is the mystery. …"
"YOUR TURN. Google" US Patent 736975 Assignee Crosby, (Enter). When they open click "Images". If you find something noteworthy use Copy/Paste.
I checked 737159 and found some non-essential info that has no bearing on…"
"Took some more sleuthing but I think I found it!
Assignee of patent was Crosby Valve & Gage (old spelling) Boston, MA; Pat #643876 ptd Feb 20, 1900. Has many uses, but it is, as I suspected earlier, a pressure gauge used in pressurizing…"
"UPDATE: I meant to say that the link showing the schematics of the invention in the upper left side has a space to type in 3 other pages. Simply type 2, 3 or 4 and click "Go". On Pg 3 is a large explanation of how it…"
"It appears the invention is not for the gauge but rather the connecting mechanism below. Says it was designed for mining and is for some type of pump...You could have found the patent yourself; all the info is on line.
Scroll down to #25 thru end.…"
Hello All, I recently found 3 large gauges in wooden boxes, one paint grey with USN on the outside. The gauge is 10" across and made by Crosby. The high pressure value and large wing nut must have made this gauge for some very specific use. Any enlightenment would be greatly appreciated. Thank you. See More
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