Weems and Plath Bi-Rola Rule 155
This rules patented vertical and horizontal rolling motion simplifies course
and plotting calculations, while the unique radial arm allows you to automatically
include compass corrections in your course plotting.
Weems and Plath Bi-Rola Rule 155
Features:
Length 13-7 / 8 in., Width 2-5 / 8 in., Thickness 1 in.
Patented four-way rolling motion
Roller body has protractor markings and a nautical mile scale
Radial arm has Loran interpolator scales and 200 millimeter rule
Automatic compass corrections
When radial arm and body are used jointly, the birola rule becomes a 440 mm (17 in.)
divider (approximately)
A speed / time / distance table is included
Easy to follow instructions
Packaged in a protective, durable vinyl pouch
UPC: 721002001559
Shipping Time: Usually Ships Within 3-5 Business Days Click here to order
