Beamster, so v.w. Beemster.
Pierer's Lexicon. 1857–1865.
beamster — noun A workman engaged in beaming or slicking hides. The beamsters bending to their tasks. ― Harpers Magazine … Wiktionary
beamster — beam·ster … English syllables
beamster — ˈbēmstə(r) noun ( s) Etymology: beam (I) (for tanning) + ster : one that beams hides … Useful english dictionary