Tribrach

Specifications :

• The levelling staff of sturdy design that meets the requirements for intensive field work. • The staff material should be one of the following: teak, cypress, kail, aimi, champ, hollock or aluminium alloy. • If timber is used as staff material, then it has well seasoned, sawn in radial direction and free of defects. • The staff is telescopic, comprising three sections without any joint in length. • The top plate made of aluminium, anodised black. • Length 4 m

Accessories

• Circular bubble sensitivity of 25 minutes per 2 mm run. • Carrying case canvas. • Plummet fittings for test and adjustment of bubble.

Description

Vernier Transit Theodolite German Pattern 10 Sec. Accuracy All Metal Body erect image, coated lens High Range Imported with Powder Coated Colured Deluxe Folding Telescopic Tripod in Cartying case complete with all standard accessories.

Description

The Hand Level is a small, economical level for use with preliminary surveys to determine traveller way or cable way steel work elevations and other feasibility type site reconnaissance work. The Abney Level is very similar to a clinometer in that it is used to measure the value of a slope by means of arc measure and grade percentage.

Specification of Abney Level

• Used to determine slope angle, tree heights etc • Graduated 0-+/-90 degrees, 0-+/-100% on a stationary arc • Vernier reads to 10 • Scale pointer incorporates friction thumb lock • Includes carry case

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.