LIBRASCOPE

[ BALANCE COMPUTERS, I.E. INSTRUMENTS FOR COMPUTING THE LOCATION OF THE LOADCENTER OF THE AIRCRAFT UNDER VARYING LOAD DISTRIBUTION, ANTI-AIRCRAFT FIRE CONTROL COMPUTERS, ] SONAR POSITION KEEPERS, TRISTIMULUS INTEGRATORS, [ I.E. COMPUTERS FOR COLOR ] ANALYSIS, INTEGRATORS, OPERATIONAL [ RECORDERS, I.E. GRAPHIC RECORDERS OF GENERAL UTILITY, SQUARE ROOT PLANIMETERS, AND PERISCOP]