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14" Canadian Pattern Y-level

1920

Balloon theodolite MkII by E.R. Watts and Son

1943

Plotting rule by E.R. Watts & Son London

1920-1940

Balloon theodolite by E.R. Watts & Son

1917

Combined optical square & hand level, British, 1920-1926

1920-1926

Part of levelling staff, British, 1915-1922

1915-1922

Levelling staff, British, 1920-1922

1920-1922

Road tracer type level with target, British, 1923-1927

1923-1927

Balloon theodolite by E.R. Watts & Son

1940

Acetylene signal lamp with heliograph attachment designed by McCaw in 1907

1910

Levelling staff, British, 1920-1922

1920-1922

Met Office Mk B type balloon theodolite, 1919

1919

Levelling staff, British, 1920-1922

1920-1922

Rangefinder, Cotton type Mk.11

Wade type spirit level, British, 1924

1924

Glass scale division demonstration, British, 1919-1922

1918-1922

Mark II Cotton-Type Range Finder

1960-1965
Brunton pocket transit compass by E.R. Watts, London, England, 1918-1922. Comprising case, compass and stand. (see stroke (and part) records)

Brunton pocket transit compass with case, British, 1918-1922

1918-1922
Three specimens of graduated scales for levelling staves by E.R. Watts and Son, c 1920

Three levelling staves, British, 1920-1922

1920-1922
Early Lens Grinding Machine by E.R. Watts & Son, London, England, c.1900.

Early Lens Grinding Machine by E.R. Watts & Son

1895-1905
Micrometer transit theodolite (sectioned), 3.5-inch, in clear plastic display case, and storage box by E. R. Watts & Son, London, England, 1926.

Sectioned micrometer transit theodolite, 1926

1926