324 ENGINEERING EVALUATION 



outlets was to permit unscrambled speech communication between aquanauts. FM music and 

 commercial television signals were provided for entertainment. FM speakers were located in 

 the berthing area and the laboratory area and were provided with individual volume controls. 

 The entertainment TV was located in the laboratory area and had the video tube enclosed in a 

 specially designed, pressure-proof container. 



Three open microphones were installed in the laboratory, living quarters, and galley for 

 continuous monitoring of conversations of the aquanauts. A commercial two-way intercom was 

 used to pass information from the surface and for limited two-way conversations. The system 

 consisted of a master unit in the topside Command Control Center and a slave unit below. 



The oxygen partial pressure output from the Krasberg oxygen control unit was transmitted 

 to the Atmosphere Control Center through the Command Control Center. The output of the 

 wedge spirometer transducer, a device for measuring the flow and volume of the lungs, was 

 also transmitted to Atmosphere Control Center. Data from other experiments and tests were 

 transmitted to the surface on the wedge spirometer conductors on a time-sharing basis. 



The signals from three closed-circuit TV cameras were transmitted to the Command Con- 

 trol Center via a single coaxial cable at three different frequencies. 



Data-Recording System 



To obtain data which would aid in future Sealab designs, provisions were made in Sealab II 

 to record certain engineering and environmental data. It was originally planned to transmit 

 some of this data to shore through the facilities of the benthic lab, but technical difficulties 

 prevented its use. The following data were recorded by hand on preprinted forms by the per- 

 sonnel on watch: 



1. Power consumption 



2. Equipment running time 



3. Temperature, interior 



4. Temperature, equipment 



5. Humidity, interior. 



Power -consumption figures were obtained from a commercial three-phase kilowatt-hour meter 

 installed on the load side of the main transfer switches. 



Equipment running time was recorded for the following equipment: 



1. Water heater 



2. Dehumidifiers (4) 



3. Baseboard heating banks (3) 



4. Deck heating 



5. Overhead radiant heaters (4) 



6. Refrigerator 



7. Freezer. 



Elapsed-time meters for the above equipment were installed in a convenient panel near the 

 watch center to facilitate recording of data by the man on watch. 



Temperature sensors were installed in the entry area, lab area, galley, and berthing area, 

 and in the refrigerator and freezer compartments. The sensors were connected to millivolt- 

 to-current converters. The outputs of the converters were shunted by a resistor to obtain a 

 to -6 volt dc output. The output from the resistor of each converter was connected to a 

 high-input-resistance voltmeter through a selector switch. This readout meter was located 



