United States Patent Office.

A.H. Blaisdell, of Newton Corners, Massachusetts.

Letters Patent No. 79,052, dated June 23, 1868.

IMPROVEMENT IN CARPENTERS' GAUGES.

The Schedule referred to in these Letters Patent
and making part of the same.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, A. H. Blaisdell, of Newton Corners, in the county of Middlesex, and State of Massachusetts, have invented a new and improved Carpenters' Gauge; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

Figures 1, 2, and 3 represent inverted plan views of my improved carpenters' gauge.

Figure 4 is a longitudinal section of the same, taken on the plane of the line
x x, fig. 1.

Similar letters of reference indicate corresponding parts.

This invention relates to a new carpenters' gauge for drawing marks parallel to the straight or curved edge of a board or other article, and the invention consists in the use of V-shaped links or fingers, pivoted to a sliding block, said links being by means of rods connected with a beam, that is pivoted to another fixed but adjustable block.

The ends of these fingers form the edge of the gauge, and they will, when the gauge is drawn along the curved edge of a board, always adjust themselves, by swinging around their pivot-pins, so as to keep the marking-point the required distance from the board's edge.

A, in the drawing, represents the bar or rod of a carpenters' gauge. Near one end of the same is formed thereon a marking-point, a, as shown.

B is a block sliding on A; it can be clamped thereon by means of a set-screw, b, as shown.

C is another block, sliding on the rod A, between the point a and the slide B. A rod, D, projects from the block C towards and through the block B, and can be clamped by means of a set-screw, c, fitted in B as shown, so that if B is clamped by means of the screw b, C can also be clamped by means of the screw c. On the under face of the block C are pivoted two V-shaped fingers,
E E, by means of pins d, as shown, the inner ends of these fingers being, by means of rods e, connected with the ends of a bar, f, that is at its middle pivoted by means of a pin, g, to the block B, as shown.