Scriber-compass with spring-loaded center punch

A scriber-compass comprising

• a pair of first and second arms pivotally connected together at first ends thereof, said arms being at least substantially straight and disposed in the same plane,
• adjustment means interconnected between the first and second ends of said first and second arms for selectively pivoting said arms relative to each other to set the linear distance between the second ends of said arms comprising a threaded adjustment rod having a first thumb nut threadably mounted thereon and means for axially adjusting said rod relative to said second arm including a second thumb nut threadably mounted on an end of said rod and rotatably mounted in a collar, restraining axial movement of said second thumb nut and attached to said second arm, whereby rotation of said second thumb nut in said collar will adjust said rod axially,
• calibrated scale means on said adjustment means for visually indicating said linear distance,
• a scribing point on the second end of said first arm and lying in said plane, and
• punch means comprising a housing secured on the second end of said second arm to form an extension thereof and a punch, lying in said plane, reciprocally mounted in said housing for movement between an upward loaded position and a downward released position for automatically releasing said punch from its loaded position for punching a centering hole in a workpiece adapted to have a circle scribed thereon upon depression of said second arm against said workpiece.