The Dobbie-McInnes "Farnboro" indicator
Japanese scientists develop simple optical indicator
Cathode ray oscillograph and its application to engine indicators
Recent developments in engine indicators
Electric indicator for high speed automotive Diesel engines
Electric indicator for high speed automotive diesel engines
Electric indicator for high speed automotive diesel engines
Valuation and testing of electric engine indicators
Valuation and tests of electrical engine-indicators
Rose indicator for study of combustion in internal combustion engines
Rose indicator for study of combustion in internal combustion engines
Flight Investigation of an NACA Ice-detector Suitable for Use as a Rate-of-icing Indicator