WOptical instrumentWAutocollimatorWCathetometerWCoherence scanning interferometryWDipleidoscopeWDisappearing-filament pyrometerWDynameterWErygmascopeWGlossmeterWInterferometryWLevel (instrument)WMirror galvanometerWPolarimeterWPost InstrumentWPseudoscopeWReynolds and BransonWRhinoscopeWSpherometerWStereoautographWTheodoliteWTotal stationWUpside down gogglesWW. Watson and Son
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