Optical Square Complete In Wooden Box Round Type

Description

The Plane Table Surveying Instruments include standard accessories like Trough Compass, Spirit level, Canvas cover, Plumbing Fork etc., and is also with a fitted tripod. Uses of Plane Table in Engineering Surveys: • Maps preparation • Recording topography Accessories included in Plane Table Surveying Instruments: • Plane Table Board 750 x 600 mm, thickness 22mm & 16mm • Carrying Bag for Board • Teak wood Polished Stand • Stand Rigid Brass Head & Plate, • Magnet Trough compass brass • Spirit Level brass • Sight van 24" • Plumbing Fork • Plumb Bob

Description

• With steel pole Size 1.5mm dia with tilting type • With steel pole Size 1.5mm dia without tilting type • With steel pole Size 2.0mm dia with tilting type • With steel pole Size 2.mm dia without tilting type

Description

a) Manufactured meticulously using International Standard. b) Tightly sealed construction for use in any weather. c) Fast accurate two-speed focusing. d) Friction-braked rotation and endless horizontal drive. e) Optical sight for quick pointing. f) Metal circular bubble. g) Fit all tripod with G5/8" or M16 screw.

Optional accessories :

Metal or wooden tripod, metal or wooden staff range pole, measuring rope, plumb etc

Description

The Cross-Staff was used at sea from the beginning of the 16th century until the first half of the 18th century. It was used to measure the sun's altitude, especially at the meridian passage. With the knowledge of the sun's declination, the mariner could then obtain his latitude. The staff is original, with the inscription. The cross pieces are replicas. Different cross pieces were used depending on the altitude. A different scale is on each side of the staff.