Description:
Grover & Co. technical drawings: Drawing on graph paper with annotations relating to Wheels and Pins. MP 102/102. 'VOID' written out with pin positions marked (17 pins for 'V', 24 pins for 'O', 9 pins for 'I' and 26 pins for 'D'). The wholes which were left out is indicated. Annotation: 'Wheels arranged for 16 revolutions on handle. Perforation 1/8 pitch pins. Drawn out below 4 lines full size.' Undated. 55cm x 22.5cm.