When the neighbourhood of iron renders the use of the magnet uncertain, a plate or plane table is employed.
Of such apparatus, two of the simplest are the plane table and the camera.
A plane table is simply a drawing board mounted on a tripod so that it can be set up and worked upon in the field.
The boy, not to be outdone, insisted on carrying the plane table, and to his delight we called him a soldier too.
After he had placed the plane table on a tripod and upon this the alidade, he started to work.
The straight edge of the ruler is placed against the needle which marks the station at which the plane table is set up.
The finer ground matter is washed on a plane table, over which a current of water is made to flow.
So I put away my pencil, folded up the plane table, and went to investigate.