. Design and operation of a carbon-14 biosynthesis chamber. Carbon; Growth (Plants); Growth cabinets and rooms. 4 SAE THD. ->iiM—hft-* DRILL HOLE FOR NO. 12 WIRE. Figube 5.—Pressure-tight electrical fitting, showing machine work detail and dimensions. PRESSURE TIGHT FITTINGS FOR REFRIGERATION TUBING THERMOREGULATOR FITTING FOR CHAMBER EVAPORATOR !^3 FACE THIS SURFACE WITH HARD PERMATEX I FITTING- SOLID 2- GLANO - SOLID 3. INNER GLAND - SPLIT 4 SOAP STONE BUSHING - ! 5 FOLLOWER GLAND - SPLI" 6 NUT 7 WASHER 8. LEAD GASKET SEAL (NO. 3) WITH QUICK HARDENING PERMATEX HEX NUT SLEEVE CONNECTI
. Design and operation of a carbon-14 biosynthesis chamber. Carbon; Growth (Plants); Growth cabinets and rooms. 4 SAE THD. ->iiM—hft-* DRILL HOLE FOR NO. 12 WIRE. Figube 5.—Pressure-tight electrical fitting, showing machine work detail and dimensions. PRESSURE TIGHT FITTINGS FOR REFRIGERATION TUBING THERMOREGULATOR FITTING FOR CHAMBER EVAPORATOR !^3 FACE THIS SURFACE WITH HARD PERMATEX I FITTING- SOLID 2- GLANO - SOLID 3. INNER GLAND - SPLIT 4 SOAP STONE BUSHING - ! 5 FOLLOWER GLAND - SPLI" 6 NUT 7 WASHER 8. LEAD GASKET SEAL (NO. 3) WITH QUICK HARDENING PERMATEX HEX NUT SLEEVE CONNECTION OF TUBES V AND |" Figure 6.—Pressure-tight fitting for refrigeration tubing. Facilities for Plant Growth For simplicity of operation, plants were grown in hydroponic culture in the biosynthesis cham- ber. Soil was not used because of two problems: (1) maintenance of constant specific activity with soil carbon dioxide being released, and (2) recov- ery of roots at harvest, A uniform nutrient solu- tion was used for growing each crop. This sim- plified watering of the plants, because water that was lost through transpiration or evaporation was condensed and reused. Water was condensed 8 Figure 7.—Thermoregulator mounting fitting for passing a large bulb thermostat through the chamber wall and sealing around the small tube leading from the sensing bulb to the thermostat switch. from the air as it contacted the cold air-condition- ing coil, was passed through an ion exchanger to remove dissolved metals, and was redistributed to all the pots by siphon (fig. 8). All liquid and air service inlet valves were modified from standard miniature brass body, stainless steel stem valves. The valves had a short nipple soldered into the inside end for connecting tubing. Forty of these valves were prepared for air and solution handling and were mounted in the channel at the midline and in the lower angle below the windows on both ends of the chamber. i. Please note that thes
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Keywords: ., bookauthorunitedstatesdepartmentofagriculture, bookcentury1900
