Ogilvie Colliery (wales) Theodolite, tribrachs & Targets
A good mid-20th Century surveyor's theodolite by Hilger Watts of London, together with a pair of tribrachs and theodolite targets. All ex-Ogilvie Colliery in Wales. The mine opened in 1864 and closed in 1975. At its peak, it employed 1,112 men and extracted 15,000 tons per week. SOLD - but please visit my online shop for similar items.