Notes: "W. H. Harling made nothing but handmade slide rules, never switching to automated dividing engines. Under high magnification you can see that all the lines and tick marks were hand-scribed, and the numbers were hand-stamped, even on their celluloid-faced slide rules, like this one. This slide rule would be considered an improved Mannheim model, with the addition of a K scale. Only the S, L, and T scales on the back of the slide are labeled. This slide rule must have been UK government property at some time as the Air Ministry has put their stamp on the back. This slide rule has the wrong cursor. This cursor appears to be from an A. G. Thornton “PIC” slide rule, and is a little too wide for this rule."
