Excuse my ignorance. First I thought that you were talking about BRAKE
CALIPERS. So, I went to Google and got a more realistic description of
the gold-plated calipers. Am I warm?
"No. 73, 79, 83 Series
"Yankee" Spring-Type Calipers and Dividers
with flat legs and quick-spring or solid nut
Nos. 73, 79, 83 Series
4, 6, 8, 12" (100, 150, 200, 300 mm)
Starrett "Yankee" Calipers and Dividers are made from a high-grade steel
and well finished. The legs are made of flat stock and are very durable.
The fulcrum stud is hardened and has a smooth bearing surface. The bow
spring, although flexible, is exceedingly strong to assure reliability.
All sizes are available with either spring nut or solid nut. The
Starrett quick-adjusting automatic-closing spring nut is designed for
making fast, positive adjustments. The threads of the nut firmly engage
the screw at the slightest pressure from the leg. When the pressure is
withdrawn, the nut automatically releases itself, sliding freely over
the screw. This feature saves time in opening and closing."
There are some pics that illustrate what the calipers look like.
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