Davis 15-inch Parallel Rules – 31942

The Davis 15-inch Parallel Rules, model 31942, are a vital navigation aid designed for mariners and navigators to maintain precise control during chart plotting and course alignment on maps. The completely transparent clear optical finish assures an unobstructed view of charts and information, enabling precise plotting without parallax errors.

• Transparent Design: A clear optical finish for visibility and accuracy in plotting.
• Size: Each blade measures 15 inches (38 centimeters), providing extensive reach across nautical charts.
• Comfortable Handles: Large and easy-to-grip for ease of use and convenience during prolonged navigation tasks.
• Precision Molded: Ensures straight lines for accurate plotting and can withstand frequent use.

Frequently Asked Questions

What is the purpose of parallel rules?

Parallel rules are used in navigation to plot and transfer course lines, as well as to measure distances on a nautical chart or map.

Are the handles of the Davis 15-inch Parallel Rules comfortable to hold?

Yes, the Davis 15-inch Parallel Rules are designed with large and easy-to-grip handles for maximum comfort and convenience during use.

How long are the blades of the Davis 15-inch Parallel Rules?

The blades of the Davis 15-inch Parallel Rules measure 15 inches or 38 centimeters in length, providing ample coverage for plotting and measuring.

Are the Davis 15-inch Parallel Rules durable?

Yes, the Davis 15-inch Parallel Rules are precision molded to ensure their durability and accuracy. They are designed to withstand frequent use in navigation tasks.

Can I use the Davis 15-inch Parallel Rules for both plotting and measuring?

Yes, the Davis 15-inch Parallel Rules are versatile tools that can be used for both plotting course lines and measuring distances on nautical charts or maps.

Does the clear optical finish of the Davis 15-inch Parallel Rules affect their accuracy?

No, the clear optical finish of the Davis 15-inch Parallel Rules does not affect their accuracy. It enables precise plotting and ensures clear visibility of the plotted lines and measurements.