Collection
Collection
Learning
The group
Visit us
Expand child menu
Science Museum
National Science and Media Museum
Science and Industry Museum
National Railway Museum
Locomotion
Science and Innovation Park
Collection
Search
About
Search
About
Collection
Learning
The group
Visit us
Expand child menu
Science Museum
National Science and Media Museum
Science and Industry Museum
National Railway Museum
Locomotion
Science and Innovation Park
Search our collection
All
5
People
0
Objects
5
Documents
0
View:
Filter search
Clear all filters
Image
Has Image
5
Non-Commercial Use
5
Category
Surveying
5
Object type
optical square
5
optical square; plummet level
1
plummet level
1
Maker
E. R. Watts & Son
1
Hilger & Watts Ltd
1
Hilger and Watts Limited
1
J H Steward
1
J. H. Steward
1
Place of origin
Debden
1
Debden, Essex, England, United Kingdom
1
Europe
1
London
1
London, England, United Kingdom
1
Strand
1
Strand, City of Westminster, London, England, United Kingdom
1
United Kingdom
1
Date
From year
To year
filter
Combined optical square & hand level, British, 1920-1926
1920-1926
'Sitesquare' optical square, British, 1959
1959
Optical square for use with telemeter, British, 1904-1911
1904-1911
Optical square, British, 1851-1917
1851-1917
'pop-eye' optical square, British, 1980-1985
1980-1985
