1-64. The Density Altitude Computer CP-718/UM, 1-65. When the plastic computers used at the 



although primarily designed to determine various Naval Weather Service units are 



atmospheric density, can also be used to cleaned, only a soft cloth and which of 



determine the following should be used? 



1. vapor pressure and "r" factors 1. Alcohol 



2. vapor pressure and specific humidity 2. Ditto fluid 



3. specific humidity and "r" factors 3. Plastic wax 



A. specific humidity and station pressure 4. Soap and water 



