Weems & Plath Triangular Protractor #102
Clear plastic triangle with edges marked in black numerical increments and lines. Semi-circle at center is marked with numbers 1 to 8 and radiating lines. Raised groove at center, probably for holding a…
Weems & Plath Compact Parallel Plotter #060
Clear plastic rectangle with silver metal bar along the bottom. Edges of the plastic are marked in black with numerical increments and lines. Semi-circle at center is marked with numbers and radiating…
Weems & Plath Parallel Ruler #140.
Two clear plastic rulers with numerical increments marked in black. The two rulers are aligned parallel to each other and are connected by two silver metal arms. Each ruler has a small metal knob handle. Two cork…