Appendix 6 



Circuit diagram and list of components required to construct the "switchbox" 

 cooling circuit for thermocouple psychrometers . 



Quantity 



1. Resistors (all resistors are 1%) 



a. 82 ohms 1 



b. 10 megohms 1 



c . 2 . 15K ohms 2 



d. 1.0 ohm 1 



2. Trimmer potentiometer, 5K ohms 1 



3. Battery, 1.35 volt mercury 2 



4. Potentiometer, 100K ohms, 10 turn 1 



5. Milliameter, DC 1 



6. Switch, shorting rotary, 4 poles, 2-6 positions, 2 sections 1 



(Note: This assembly should be mounted in an insulated aluminum box similar to that 

 shown in figure 7.) 



AFLC/HAFB, Ogden 



27 



