The mountain consists of a double top, the one pointed very sharp, and commonly appearing above any clouds, the other blunt.
Peyrade struck the cover of the box to see if there were a double top.
My impression is that the table acts something like a condenser, in which case the purpose of a double top can be understood.
The double top, drawers, and shelf should be a part of the larger table also.
D is another kind of plane, called the trying plane, having a double top or handle.