Maker

Hewlett-Packard, USA

Model

Tribrach (Levelling Base) HP 11426A

Serial Number

none

Dimensions

90 mm radius, 62 mm high

Image

Description

The tribrach is shown on the right in the above figure.

The HP 11426A is a heavy duty tribrach with three levelling screws. It features a Kern-type cylindrical central bore and lever arm for the centring and locking of attachments.

This tribrach was designed for the HP 3820A electronic tacheometer and its associated EDM reflectors.

It fits Wild-type tripods with a 5/8 inch x 11 mounting screw.

The collection holds three tribrachs labelled A, B, C.

History & comments

See brochure HP "Civil Engineering Products" (Part No. 5952-9153) for details.

Conservation

Condition

Lightly corroded aluminium parts.

Remarks

A: "No.2" marked in feltpen in dish.

B: "3", "11425A" engraved 11424A, PC 44732

C: "I", "11425A" engraved PC 44731

Dates

Catalogued in 2007 by JMR. Photo by JMR.