Parallel Rules: Rolling Rules: Brass Rulers

Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other. [edit] History The parallel ruler was invented in about 1584 by Fabrizio Mordente, but it was not in common use until the 18th century.[1] Captain Field's Improved Parallel Rule In the 19th century, a Captain William Andrew Field (c. 1796 - 1871) improved the design by adding a protractor-style scale to the upper edge of one rule, and compass points to the opposing edge, which made reading bearings easier.[1] Examples exist of boxwood, ivory or ebony, usually with brass hinges.[1][2] The instrument usually had two links, but longer models sometimes had three,[3] and sometimes the links were scissored.[4] Another variation is the "roller" model which included a cylindrical roller for ease of use

Captain Fields Parallel Rules
Captain Fields' Pattern - Bar Parallel Rule 600mm

Divided with protractor markings (double reading) and compass points
Manufactured& from high quality 6mm acrylic
Bevelled on all four edges with solid brass links

Leisure Range of Parallel Rules
Leisure Range Parallel Rule Acrylic

Manufactured from 5mm crystal clear acrylic fitted with marine grade alloy bars and lifting knobs.
The bars are fitted with Marine grade brass pivot pins.
The rule blades are fitted with rubber non slip pads.

3 Bar Parallel Rules
3 bar parallel rule clear acrylic available in several sizes

Parallel Rolling Braked Rules
Rolling Parallel Rule Acrylic
Fitted with solid marine grade brass rollers on a stainless steel spindle and pivot points.
Engineering grade PVC spindle cover with solid marine grade brass pivot holders.
The rule is Captain Fields divided 0 to 360 degrees and Compass points.

Acrylic Rolling Braked Parallel Ruler

Fitted with solid marine grade brass rollers on a stainless steel spindle and pivot points.
Engineering grade PVC spindle cover with solid marine grade brass pivot holders.
The rule is Captain Fields divided 0 to 360 degrees and Compass points.

Master Mariner Range Brass Parallel Rules
Master Mariner Parallel Ruler Brass from £106.16
Manufactured from 5mm Marine grade brass blades
Marine grade brass bars, pivot points and lifting knobs.
The blades are fitted with rubber non slip pads.
The rule is fine grade finished and heavy duty lacquered for a non mark finish.
The rule comes complete in a fitted wooden case which can be personalised with an engraved solid brass plaque at an extra cost.
The plain rule can be supplied divided with Captain Fields markings 0 to 360 degrees and compass points.Traditional Brass Parallel Rule

A Quality Range of Nautical Instruments and

Parallel Rules,

. Our nautical instruments include a selection of ranges styles and price ranges to suit all our clients from the economical Student and Night Class range through the intermediate Leisure Skipper an Blundell Harling range, and for the Professional or discerning yachtsman the Master Mariners range

Parallel Rules

. All the solid brass dividers and pencil compasses are precision yet robust and several ranges are approved by both NATO and the MOD (Ministry of Defence) for use by the Navy

Parallel Rules

At the top of the range we have Solid Brass Parallel rules and Roller and Braked rulers Parallel Rules . These very high quality precision instruments come wooden boxed and can be personalised with engraving the name of the ship, yacht, captain or owners on the box plate or on the rules themselves Parallel Rules The Portland chart plotter range of and navigation squares, Breton plotters Captain Fields Pattern parallel rulers and much more. Take a browse through our products, you can even assemble your own customised chart work instrument plotting pack to suit your individual navigational needs, Parallel Rules