CUP Testing Dates

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  • Last Post 13 February 2019
Bryan Austin posted this 12 February 2019

I never have really dug deep on the history of the copper units of pressure testing. Can anyone out there tell me when this method was first used exclusively for cartridge testing?

Also, can anyone give original Winchester and Colt testing dates/results for the -40 cartridges as well as the 45-70 types and 45 Colts?

If I knew what I was asking, I could ask it better ;-)

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Ed Harris posted this 12 February 2019

Rodman pressure gauge dates from Civil War era and was first used for artillery: https://www.sciencedirect.com/science/article/pii/0734743X9090026R

The engineering contributions to heavy military ordnance of Captain (later Lieut.- General) Rodman are summarized from the seven technical reports he published during a 4-year period, 1856–1860, just before the American Civil War (see Fig. 1). His principal original contributions included, the internal or bore cooling of (hollow) cast guns, the introduction of the cutter gauge to measure gun powder pressure, studies of gun life endurance (fatigue) due to repeated firing and the development of prismatic gun powder, among many others.

Rodman's name and work is little known among to-day's engineers and scientists (U.S. as well as British) though he may occasionally be recognized in connection with the development of the ‘soda bottle’ shaped gun, which is more usually attributed to Admiral J.H. Dahlgren [1] (see Fig. 2).

The objective here is to identify Rodman's significant achievements and to illuminate the background to his contributions, to the development of the ‘soda bottle’ gun and his associated work in engineering science.

An appended long Note 3 collects together some remarks about the books that were available for early 19th century engineering students at the Military Academy, West Point, in mechanics and strength of materials.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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Bryan Austin posted this 12 February 2019

Thanks Ed....this youtube video is really cool!

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RicinYakima posted this 13 February 2019

The modern pressure testing equipment was made by the Potter Manufacturing Co in New York. I believe he sold his first one to Hercules Powder in about 1936. I don't think there were any other commercial makers.  He went out of the business in the 1960's. He also made loading tools of very high quality and very expensive.

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