It occurred to me one could use a laser level to project arch shapes.
Sit the level lower than the wanted arch, set to horizontal line, and
tilt it upwards. You now get a perfect arch shape on the wall.
Anyone done this? And would it be any use? The destructions dont
mention anything about it.
My first thoughts were that you *would* get an arch, but it would be
But Dave is right - the mark on the wall will be the intersection between
the (hopefully) vertical plane of the wall and the inclined plane of the
laser beam - which will be a straight line.
The following technique might be useful however:
1) Make a scale model your arch.
2) Site your laser level.
3) Mount your arch*.
4) Shine your laser level so the on the wall is half obscured by the
model, and have someone mark it.
5) Repeat 4 for the perimeter of the wall.
* The model needs to be parallel to the wall; have its top on the line
between the desired top of the arch and the point of rotation of the LL;
have the ratios of the distance from the wall to it, and from it to the LL
in the ratio of the sizes of the arch and it.
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