0210
   VERNIER THEODOLITE  
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  Surveying Instrument Collection 

Maker

Stanley, London, England

Model

N/A

Serial Number

114497

Dimensions

Height 365 mm

Image

Stanley Vernier Theodolite

Description

This is a Vernier Theodolite incorporating the famous Stanley solid 'U' frame single casting design, where the support for the horizontal axis is cast in one piece. The instrument therefore features a vernier reading system for the horizontal and vertical circles instead of an optical micrometer system. The circles are equipped with magnifying glasses attached at opposite ends of each circle for more comfortable vernier reading. The instrument consists of: (1) a levelling base which supports the main working parts of the instrument and is capable of being screwed onto a tripod, (2) a lower circular horizontal metal plate with a silver vernier graduation, (3) an upper circular horizontal plate, (4) a vertical circle with vernier graduations and (5) a telescope with an altitude bubble attached beside the vertical circle.

 

History & comments

The vernier is an auxiliary graduation, placed alongside the main one with the purpose of determining fractions of the graduation unit. The vernier is typically used with theodolites of medium or low accuracy, as well as for simple angle measuring devices.

Conservation

In a wooden storage box

Condition

Good

Remarks

  • The silver vernier graduation on the vertical plate is slightly faded
  • The horizontal circle is enclosed for dust prevention
  • Catalogued by T. Ko
  • Updated by F. Pall

Dates

Manufactured in 1910 (approx.). Catalogued in 1997.

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