"> 2497) I first have to ask a question: Does the metal
The metal piece doesn't come out, we removed the screw at the large end but the metal part was still held by the smaller pin.
I have a close-up of it that I forgot to post, it can be seen here:
From Rob's answers:
2502. This tool is an Alidade, a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to draw a line on a plane table in the direction of the object or to measure the angle to the object from some reference point. Angles measured can be horizontal, vertical or in any chosen plane. The alidade's primary use is for creating maps in the horizontal plane.I actually thought of that based upon the ends (which reminded me of the
2 pieces of rifle's sight), but I couldn't account for the 3 clips on the base. Is there something extra there?Bill
Only one of them (the center one) is a clip, to keep it closed when not in use.
The other two are link arms which pivot on the main base and the narrower part beside it, allowing it to move out from the side while retaining a state of being parallel to the main one. (The four parts form a parallelogram.)
Enjoy, DoN.
DoN, I "see it" now. Thank you for explaining!
I tried searching on/for that idea, but couldn't come up with anything solid. Some examples, like this newer patent shows that a square shaft is sometimes used in the mechanism:
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.