Circular plotting protractor patented by E.R. Zent

Made:
1960-1970

Circular plotting protractor patented by E.R. Zenthon in 1960, aluminium, 2 ft inner diameter, with 8 aluminium scales and perspex centring sheet in fitted wooden box

Details

Category:
Mathematics
Object Number:
1988-9
type:
drawing instruments
credit:
Gimpel, A.