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US2548548A
|
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Concave grating spectrograph of the rowland type
|
|
GB631748A
|
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Improvements in and relating to concave grating spectrographs
|
|
GB615649A
|
|
Improvements in or relating to machines for grinding and polishing non-spherical optical surfaces
|
|
GB607481A
|
|
Improvements in optical gauging
|
|
GB585806A
|
|
Improvements in and relating to optical dividing heads
|
|
GB560325A
|
|
Improved optical instrument for testing and gauging
|
|
GB559748A
|
|
Improvements in and relating to combination angle gauges
|
|
GB555672A
|
|
Improvements in or relating to interferometers for determination of length
|
|
US2298875A
|
|
Coordinate measuring machine
|
|
GB541183A
|
|
Improvements in and relating to co-ordinate measuring machines
|
|
GB528701A
|
|
Improvements in or relating to photometers
|
|
GB501606A
|
|
Improvements in the manufacture of diffraction gratings
|
|
GB428013A
|
|
Improvements in trichromatic colorimeters
|
|
GB439827A
|
|
Improvements in or relating to x-ray photographic apparatus
|
|
GB432306A
|
|
Improvements in or relating to spectrophotometric analysis and prediction
|
|
GB438511A
|
|
Improvements in or relating to spectrophotometers
|
|
US2065953A
|
|
Apparatus for investigating absorption spectra of substances
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|
US2057927A
|
|
Optical inspection of screw threads
|
|
GB427983A
|
|
Improvements in cameras for colour photography
|
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US1966769A
|
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Apparatus for producing or analyzing polarized light
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