Graphical Construction Glossary >> Tools. >> Hand Tools >> Beam Compass

Beam Compass: A setting out tool that is used for scribing circles and arcs.

One of two similar ends of a compass that is about 2 feet long. Made by Stanley in 1880. This is a very precise instrument with a finely graduated scale for accurate measurements.

A beam compass like this on in the London Science Museum can of course be used for very precise work in drawing or scribing circles and arcs. More than that though it can be used for stepping out a series of equidistant points, for example say on stair strings in stair design. In effect the beam compass can do everything that a wing compass can do but on a larger scale, because the beam can be made as long as necessary.

Here is a photo from my trammel page where you can see a short length of timber being used with a couple of trammel heads. I am using it in the setting out of floor tiles.

A compact modern compass from Rockler.

Above is an interesting version on the theme. This smart little tool has been designed by someone who utilised the compact nature and available technology of tape measures.

It can of course be used as a compass and scribe large arcs.
Again like the others above it can be used for stepping out equal distances.
Unlike the others it has the additional feature of being able to be used as a gauge. That is running parallel lines down the length of a board.

If you live in the US and you like the look of it find out more on the Rockler site.

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Please Note! The information on this site is offered as a guide only! When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area. It could be out of date! Regulations breed faster than rabbits!
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