Tiny, well made of brass, and nicely knurled. One has replaceable cutter blade inserts and the other replaceable needle points. A 3/16" square opening for some sort of driver and a knob to tighten the tools to the driver. I give up, any thoughts?
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Imagine a bar through the square holes. Lock the thumb screws down at a given distance apart. Set the point in the center of your circle and scribe the outside of the circle with the blade.
What the intended material for them might've been is lost to time, but you could lay out plenty of doll house table tops and bar stools with it.
Yes, if I built a doll house, it'd have bar stools.
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they are usually stored slipped over a small wooden dowel as the beams can be quite long and are often home made. There are usually several sets of points-straight, curved, hole centering, cutter, ink nibs, pencil leads etc. Included, sometimes attached to the heads. Also there is usually a thumb wheel adjuster.
What you have appear two be two of the primary (center) heads, with points/collets but they could also be small scribers or cutters.
Here is my miniature Brown & Sharp beam trammel-about 4-1/2 inches long an dating to the thirties. You can see the attachments in the box. This trammel comes with a beam.
Notice the thumb knob for the moving point when drawing or laying out a circle.
These were made to be set with a shop scale and can be set quite accurately, especially if you have good eyes.
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Here is my Tacro Beam Compass. The top of the beams are knurled to wheels in the heads. Bottom of the box is a blade, a ruling pen, a clamp for pencils, rapidograph pens, etc. a beam connector and leads and points. Below the box is a green 3ft. beam. Photos below that is a compass I made for my router. Gar
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