It consists of a sculptured figure in stone, which bears in its arms a compass and a T square.
In his model the double parallel ruler is replaced by two endless strings and pulleys, and the bar, B C, by a T square.
The T square must have a thin blade—about 1⁄16 of an inch, and be made of hard wood.
Where the measures vary in length the ruling will most readily be done in light pencil with a T square, and afterwards inked.
A T square, with a blade 24 inches long attached permanently to the stock, but not sunk into it.
It was a Royal pageant arranged as we do these things at home by men of T square and double entry, energy and goodwill.
The upper end of the T square is raised above the paper, and forms a bridge, under which the cart travels.