Albert Gallatin Mackey,
Manual of the Lodge
(1868)
“ They are called immovable jewels, because they are always to be found in the East, West, and South parts of the Lodge, being worn by the officers in those respective stations. The movable jewels are the Rough Ashlar, the Perfect Ashlar, and the Trestle-Board. [9] The rough ashlar is a stone as taken from the quarry in its rude and natural state. The perfect ashlar is a stone made ready by the hands of the workmen, to be adjusted by the working tools of the fellow-craft. The trestle-board is for the master workman to draw his designs upon. ”
