Full Details

Name and Model Number Barth, Carl
Complete Machinist
Lathe Slide Rule
Country of Origin USA
Date of Manufacture 1926
Front Scales Special scales for efficient turning of iron on a lathe
Back Scales NONE
Scale Length  
Type of Rule Slide Rule
Construction Varnished paper scales on heavy mahogany. 50.8-cm x 19.0-cm; 4 exchangable slides and one exchangable insert for using this slide rule for other metals.
Area of Use Technical
Comment Carl Barth promoted Frederick Taylor's "Scientific Management" theories in the machine shop workplace; made to order for G.E. Schultz. Dated Feb. 12, 1926. Carl Barth signed this slide rule. Barth was a consultant to the machine tool industry from about 1900 to 1928. This is one of his last designs and may be one of a kind.
Rarity RRRR
Donor Collection of Ed Chamberlain
Match Number 124
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.