I love old machines, and found the video interesting, however I think he's over estimating the weight of the vise, as the heaviest vise made by Parker was 254 pounds. The heavy base was probably made by Athol Foundry, but certainly not by Parker, as Parker only poured with shank ladles, carried in a bale by two men.
Their cupola was very small, and probably didn't have more than a one ton per hour capacity. My grandfather ran that foundry for many years.
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