Whaler = low- profile stiffeners for steel framed flats – a steel hog trough [1]
hog trough = "angle iron" made of wood. L shaped piece of wood [2]
So a Whaler is used to made the set panels flat and thinner than a hog trough support/framing. The whaler differs from the hog trough use steel/metal not wood that a hog trough use.
So is this even close?
sources
[1] Technical design solutions for theatre: the technical brief collection By Don Harvey, Yale School of Drama. Dept. of Technical Design
and Production (page 150) Technical design solutions for ... - Google Books
[2] Scenic design and lighting techniques: a basic guide for theatre
By Chuck B. Gloman, Rob Napoli Scenic design and lighting ... - Google Books (page 179)
WHY is it called a whaler, and what does it have to do with "large ocean mammals"?
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