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GLOSSARY ac . alternating current amp ampere candle or cycles per second, depending on context cp candlepower cps cycles per second cm centimeter db decibel ° degree direct current dc fpm feet per minute fps feet per second foot ft-c . foot-candle ft-1 foot-lambert hr . hour micron microvolt mph miles per hour ma milliampere me megacycles per second ml millilambert mm millimeter me millimicron . . mln mmute prf pulse repetition frequency rms root mean square S/N signal-to-noise ratio square sq cm square centimeter sq ft square foot sq in. square inch in. inch sq m square meter kc kilocycles per second . . sq mm square mllllmeter kv kilovolt v . volt lambert va . volt-ampere pa lm . lumen microampere w watt yd yard ,~1 microlambert yr year 205