Zur Ergänzung (GB) hier die Einträge aus dem OED online (Oxford English Dictionary):
a. One who makes tubs, a cooper.
b. One who lives in a tub, a cynic like Diogenes.
c. A rowing man who is 'coached' in a 'tub' (nonce-use).
d. One who tubs: see TUB v. 1b. [folgt im nächsten Posting]
1825 BROCKETT N.C. Words, Tubber, a cooper, a maker of tubs. 1883 Almondbury & Huddersfield Gloss., Tubber, a cooper. 1891 Blackw. Mag. Mar. 374 A concession to Diogenes and other tubbers. 1894 Sporting Life 28 Feb. 6/2 Shortly after four o'clock tubbing practice was begun... Lewis and Kerrison were the third set of tubbers taken out.
A tool used in Cornish mines: = Beele*.
1671 Phil. Trans. VI. 2104 The Instruments commonly used in Mines, that serve for ripping the Loads... A Beele or Cornish Tubber (i.e. double points) of 8 l. or 10 l. weight, sharped at both ends, well steeled and holed in the middle. 1753 CHAMBERS Cycl. Supp., Tubber-Men are the people who work with this tool, ... called in other places beel-men.
*Obs. or dial. A pick-axe with both ends sharp, used to pick out the ore from the rocks.
Zu den deutschen Entsprechungen (landschaftliche und andere) äussere ich mich lieber nicht (ob Böttcher, Schäffler, Küfer, Küper, Fassbinder, Weißbinder, Binder, ... für das "tub making" [A.a.] -- Badender, Bader, Wascher, Pökler, Trainer, Abdichter, Einweicher, ... für den, der "tubt" [A.d.], usw.)