ifcj* -r -• 



M^ 



PRESSURE CHAMBER 

 THERMOMETER RACK 



Figure 9. Pressure vessel for calibration of unprotected reversing thermometers. 



VALVE SYSTEM 



MANUAL PRELOADING PUMP 

 (BEHIND SAFETY PLATE) 



DEADWEIGHT 

 PRESSURE GAGE 



Figure 10. Deadweight pressure gage with hand pump and valving system. 



20 



