RTM
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Brass. Can't paste a screenshot right nowI believe those were brass, Aluminum, or some such, which conducted heat much slower than steel, per Stanley catalogs. Can't search now.
Stanley Tools : Catalogue No. 34 : 1915 : Stanley Rule & Level Co. : Free Download, Borrow, and Streaming : Internet Archive
152 p., illus., 18.8 cm, trade catalog
archive.org
Stanley Tools for Carpenters and Mechanics : Catalogue No. 34 : 1929 : The Stanley Rule & Level Plant : Free Download, Borrow, and Streaming : Internet Archive
204 p., illus., 29.6 cm, trade catalog
archive.org
This Rule consists of two legs made from spring brass, joined together by a brass joint containing a stiff spring which holds the rule rigid when open. Particularly adapted for measuring hot metal, as it can be cooled by plunging in water without rusting. They have a rivet joint and are ^ of an inch wide— Graduated in 16ths of inches.

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