Vintage The Cleveland Twist Drill Co.
Circular Drill Speed Calculator Slide Chart
This is a Vintage (copyright 1911) The Cleveland Twist Drill Co. Circular Drill Speed & Tap Size Calculator Slide Chart
3" Celluloid spinner gauge from the 1910s era
Used to help adjust the drill speeds for Wrought Iron, Machinery Steel & Soft Steel back in the years before World War I
Working dial on the front and back that actually moves freely and still works fine
A great early item ready for display!
This is an ORIGINAL item, NOT A REPRODUCTION item!
Has usual wear expected from years of normal use (see photos for clarification), but still a great example of an uncommon collectible item!
“E.R.K.” etched on backside below Chicago
No other issues noted
See all pictures
Please contact us with any questions!