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Hall & Watts Defence Optics Ltd. SM1 MkV Pilot Balloon Theodolite

 

The model SM1 MkV Pilot Balloon Theodolite is a fifth generation instrument from a line of Theodolites that dates back to 1936 with the original Meteorological Office Pattern Theodolite Specification and the introduction of the E. R. Watts Mk I Pilot Balloon Theodolite.  The Mk V instrument is built to meet the current specifications of the United Kingdom Meteorological Service and the World Meteorological Organization (WMO).

Distinguishing features of the Mk V theodolite are the use of a Pentagonal Prism in the bent axis telescope, which allows for better stability of the optical alignment, a closed circle design for durability, two levels of magnification offering wide and narrow fields of view (accomplished with a switchable finder scope using the same eyepiece with two objectives) and a lined gradicule supporting the tail method of altitude determination. 

The placement of the azimuth and elevation circles directly above each other as well as the use of Micrometer drums facilitates rapid determination of azimuth and elevation directly to the 10th of a degree.

watts5.jpg (27942 bytes)
Photo provided by Hall & Watts.
Note the theodolite in the photo is shown without the Battery Box installed. A view with the battery box installed and some accessories can be found on this page.

Specifications:
Wide, 5x  Magnification with a 8 Deg. field of view
Narrow, 20x Magnification with a 2 Deg. field of view
Circle graduated in 0.5 Deg., Micrometers in 0.1 Deg.
Weight: 6.8KG Instrument only, 11.4 KG with case

Contact Information:
Hall & Watts Defence Optics Ltd
Unit A3 Merlin Centre
Acrewood Way
St Albans
Hertfordshire AL4 0JY
UK
Tel:  +44 1727 791200
Fax: +44 1727 835683

E-mail:  sales@hallwatts.co.uk