Octangonal Cross Staff

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.

Description

Size 178 mm /7 Internal focusing, anti reflection coated optics with tilting arrangement and Fitted with revolving horizontal circle graduated to read 6 minutes with vernier and a provision to preset zero degree quickly. The tilting drum is graduated to read 1 : 5000 is incorporated for fine adjustment and accuracy. Supplied with accessories and adjusting tools Packed in PVC Plastic box with Aluminium telescopic stand in carrying canvas cover.

Description

This cost-effective Electronic Digital Theodolite provides excellent performance, reliable quality and practical operation for any construction application. The body style is similar to a Topcon Digital Theodolite and is combined with easy to use operation. The smart appearance and reasonable structure is as attractive as its price. • Tribrach. • AA Rechargeable Batteries (4 each). • Lens Cap. • Operator's Manual. • Hard carrying case.

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