Parallel Rule?

[Dennis McDonaugh]

What is a parallel rule used for?

[Bob Smalser]

Setting up the TS for cove cuts is the primary reason I make them

http://pic3.picturetrail.com/VOL12/1104763/4959362/63044267.jpg

http://www.sawmillcreek.org/showthread.php?t=11233&highlight=spar+plane

[Michael Perata]

Back in my old sailing days, before GPS, used to use them to mark off bearings on maps.

[Dennis McDonaugh]

Thanks, I couldn't see what you'd use it for just by looking at it.

[Tyler Howell]

Back in my old sailing days, before GPS, used to use them to mark off bearings on maps.Even with GPS I always keep a Rum line with a little DR;)

[Dennis McDonaugh]

Okay Tyler, What's a Rum Line? As soon as I find out one thing there are three other things I don't know!

[Steve Cox]

I think it is a bastardization of "rhumb line" which is a course for a vessel that maintains a constant compass bearing. In use it probably means a vessels straight line course.