TELESCOPIC ALIDADE: Size 175 mm (7”) internal
focusing with vertical circle gradated to read 30 min. with vernier extendable
base plate, extendable to 375mm (15”). The spirit level is mounted on the top
of the telescope is fitted with pull out glass stadia diaphragm. The vertical arch
fully divided is half degree divided giving angles of elevation and depression
readable by magnifers. The instrument is supplied in a wooden box