Bates boatbuilding tools and people 2

Patrick Chapman on fordeck of the Trumbly 38, preparing to install the Sampson posts, fall 1977.
Display in the classroom, done by Trumbly, showing how propellers are designed and modeled. The design process is shown to the left and is scarcely visible. The middle row (for example) shows (L to R) a half-pattern, one element, elements glued together for a model, a finshed wooden model, and the bronze propeller cast from the model. The propeller appears to have been trimmed after casting.
Specialized bevel gauges invented by Trumbly and routinely made for personal use by students in the Boatbuilding program. Above, a self-reading gauge for taking plank bevels. Below, a self-reading gauge for taking any bevel.
Unidentified tool for doing something, though I no longer remember what.
Tilting-arbor plank cutter, used for cutting a continuously changing bevel on planks. At the base of the machine is a spiling batten used for making a plank pattern.

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Tilting-arbor plank cutter, detail (2003).
Tilting-arbor plank cutter, detail (2003)
Titing-arbor plank cutter, detail (2003)
Tilting-arbor plank cutter, detail (2003).