Optical opposite, British, 1840-1850
1840-1850
Raper type optical opposite, British, 1824-1834
1824-1834
Surveying Spikes
1885
Optical opposite & square, British, 1801-1830
1801-1830
surveying square, European, 1601-1700
1601-1700
100-foot surveying chain
1885
Box containing preformed curves used by Brockbank
2ed laser guidance
1974