The Life, Times, and Scientific Labours of the Second Marquis of Worcester / To which is added a reprint of his Century of Inventions, 1663, with a Commentary thereon.

by Henry Dircks

“O. The O. in an oblique line from the center downwards, towards the left corner touching the line thereof.

“P. The P. in a right line from the center downwards touching the lower side line.

“Q. The Q. in an oblique line downwards towards the right corner touching the line thereof.

“R. The R. in a streight line from the center to the outside, and furthest line of the right midle and opposite chequer touching it.

“S. The S. in an oblique line from the center, and passing the right upper corner line.

“T. The T. in a streight line from the center and passing the upper-side line of the square.

“V. The V. in an oblique line from the center upwards passing the left upper corner line.

“W. The W. in a streight line from the centre to the left outside and furthest line of the left midle and opposite chequer.

“X. The X. in an oblique line downwards passing the left lower corner line.

“Y. The Y. in a streight line downwards passing the lower side or bottome line.