THE MODELLING PRESS.
SIZES.
| C | Bottom piece | 18 | inches | by | 12 | inches | by | 2 | inches. |
| B B | Uprights | 12 | do. | — | 4 | do. | — | 1½ | do. |
| A | Cross beam | 15 | do. | — | 4 | do. | — | 2¼ | do. |
| The screw 1⅜ths inch in diameter. | |||||||||
THE T-SQUARE.
This square is formed like the ordinary drawing-squares, with the exception that the blade A is made of steel; this is firmly screwed to a stock of hard wood, which has on each side of the blade a small piece at C C cut out; the object of this is to allow the knife to cut completely to the edge of the paper. The advantage, in fact, the necessity for a steel blade, will be obvious; were it of wood, the pressure of the knife along its edge would indent, or cut it. This square will be found adapted for every description of large and small work, but should the cardboard be of great thickness it is apt to stir, and by so doing cause irregularity of line. To remedy this an instrument is used, called an adjusting straight-edge. A is a straight ruler of flat brass, or of steel, like the blade of the T-square. It is contrived to move to and from the surface of the board upon the upright screws, B B, while a dovetail groove is fitted with a piece of brass to run along it, to allow of the horizontal movement of the ruler. The paper (upon which the cutting-off line has been previously marked) is placed upon the board, the straight-edge adjusted to the line; the straight-edge being then firmly screwed down upon it by means of the two small thumb-screws, 3 3, it is rendered immoveable during the progress of the work, this will be better understood from the annexed engraving.
THE ADJUSTING STRAIGHT-EDGE.
No. 1 is a section of the cutting-board, showing the groove in which the piece of brass runs. 2, The brass, to which is attached the thumb-screws, by means of a screw through the eye at B. 3 3 3, Thumb-screws, to screw down the ruler upon the paper. The brass rule should not be less than an eighth of an inch in thickness, otherwise it may bend; if steel it will do a little less.
