Square frame and ruler for experiments on oblique forces and the horizontal lever
Square frame and ruler for experiments on oblique forces and the horizontal lever
Pulley hook from Square frame and Ruler
Straight section for square frame and ruler, with regular holes along it.
Mahogany corner bloack for square frame and ruler for experiments into oblique forces.
Corner block from square frame and ruler
Corner block for square frame and ruler used for experiments in oblique forces.
Corner block from square frame and ruler
Corner block from square frame and ruler
Corner block from square frame and ruler
