The slotted bars may be clamped in any position and at any angle to a slotted wooden bar, ... Patent Adjustable Curve Ruler. (London: W. H. Harling.) Price 7s. 6d., 10s., and 12s. 6d.

This jig attaches to your drill press and makes it easy to drill multiple holes at any angle from 0 to 45 degrees. View full post on Youtube You'll need 3/4 inch plywood, threaded rod, and a ...