To determine this a surface plate, as it is called, is needed.
Its weak point was the liability of the surface plate to crack through under fire and become detached from its iron backing.
Of course, the surface plate must be absolutely level when tests are made.
The surface plate is a plate or casting having a true flat surface to be used as a test plate for other surfaces.
For testing the truth of flat or plane surfaces the machinist employs the surface plate or planometer.
Make cultivations, tube and surface plate, and cover-slip preparations from this situation.
The first is shown in Fig. 1464, in which a is a surface plate having its edge a true plane.
Holding the piece of spleen in the forceps, dab the cut surface on to a surface plate in a number of different spots.