Re: Surface plate maintenace

John wrote:

I wonder if it is compensated for the curvature of the earth? A 7 story building will dissapear on the horizon at about 15 mile distance.
It can't. It is a "level", so it only senses the center of the earth. So, when aligning two objects separated by many feet, you have to add in the calculation manually, or dial a calculated offset into the zeroing dial. When millwrights align a large turbo-alternator set, they have to do stuff like this. The Talyvel instruction book has a table for this.

Jon
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