society > occupation and work > equipment > machine > machines which impart power > boiler > [noun] > parts of > tubes or pipes
water tube1720
tube1833
water head1856
worm1857
cross-tubea1884
furnace-tube1888
feed collector1902
1902 Encycl. Brit. XXVI. 284/1 A horizontal cross-tube of square section, called a feed collector, which extends the whole width of the [marine water~tube] boiler.