Three Drafting or Plotting Instruments, 19th century, a brass protractor with extended arm with several imperial unit scales, and a vernier; a mahogany station pointer marked R.A. Tifield on both pointers with iron tightening knobs and points; and a mahogany pantograph with two acorn-shaped terminals, anchor disc marked WG on the underside, and graduating marking holes on each arm.
Three Drafting or Plotting Instruments, 19th century, a brass protractor with extended arm with several imperial unit scales, and a vernier; a mahogany station pointer marked R.A. Tifield on both pointers with iron tightening knobs and points; and a mahogany pantograph with two acorn-shaped terminals, anchor disc marked WG on the underside, and graduating marking holes on each arm.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
