encountered at depths of 100 feet. These meters were hand-carried by divers using self-contained underwater breathing apparatus and proved to be highly successful. Diving monitors using the instruments reported that the meters were easy to handle and to read while under water. ' { ' | Spr ee a umm pe . y t ~ 15 - ” TP 7 , “ we " teen aes a Fe be ee DL - “ . :: . . , , . . . a - - . . * ae a a bet ee 7ie ee . ‘ ed . * a . > a 4$2 var 1 © ee : + “ oe ce, ~