into the solid

into the solid

[‚in·təthə ′säl·əd]
(mining engineering)
Of a shot, going into the coal beyond the point to which the coal can be broken by the blast. Also known as on the solid.
References in classic literature ?
All around the walls of the cave were thousands of doors of silver and gold, built into the solid rock, and these extended in rows far away into the distance, as far as Ozma's eyes could follow them.
That was all right as far as it went, but the towhead warn't sixty yards long, and the minute I flew by the foot of it I shot out into the solid white fog, and hadn't no more idea which way I was going than a dead man.
When power is restored, data is automatically transferred back into the solid state memory.