This rule's vertical and horizontal rolling motion simplifies course plotting calculations. The radial arm allows you to automatically include compass corrections. Roller body has protractor markings and a nautical mile scale. Radial arm has Loran interpolator scales and 200mm rule. When radial arm and body are used jointly, it becomes a 400mm divider. Speed / time / distance table included

Portland Bar Parallel Rule

Divided with protractor markings (double reading) and compass points, these rules are made from 6mm acrylic, bevelled on all four edges with solid brass links. All other metallic parts are made from non-corrosive materials and rubber pads are fitted to the underside to prevent slipping.

Portland Bar Parallel Rule

Divided with protractor markings (double reading) and compass points, these rules are made from 6mm acrylic, bevelled on all four edges with solid brass links. All other metallic parts are made from non-corrosive materials and rubber pads are fitted to the underside to prevent slipping.

Portland Bar Parallel Rule

Divided with protractor markings (double reading) and compass points, these rules are made from 6mm acrylic, bevelled on all four edges with solid brass links. All other metallic parts are made from non-corrosive materials and rubber pads are fitted to the underside to prevent slipping.

Budget version of the Captain Fields Pattern Parallel Rule for use in the classroom. Rigid aluminium links.

Weems & Plath
Inscribed with full 180' protractor markings. Combines the essential features of a protractor plotter and a basic parallel ruler. Strong acrylic and brushed aluminium arms.

Weems& Plath
Features as per the 12"" version.

Weems & Plath
Features as per 12"" version

Unbraked

Unbraked

Unbraked

Admiralty Pattern Brass

This brass rolling rule is used by navies worldwide and is made of brass and stainless steel. Every rule is tested to roll to within 1mm over 2m. The overall finish is black and it is packed in a wooden case.

The rule can be re-adjusted with the hexagonal wrench supplied.