wsary. Tlie otlier imrricadca around the plaiit are, like the
iurnaoe barricade, desihned rather for Rame deflection than for explosion resist,ance, which would be more difficnlt to sttain. Explosion dangers have heen minimized liy attempts to make the working of the plant conve~~ient am1 iuiiorm, as veil as by paying particiilar attention to alarm arid other devices intended to make e r e i y oper:rtion foolprouf.
ing bromophenol hluc :mil tlieir ititrr a w r i l Tlie gas volume is mcasurcd and tlie R I I ~ U titrated and its pwccntage ca1c:iiated. F the gases are passed back into the syatem agaiii just ahead of the ammonia cracker. All the controls of the hyper-prcssiire on a pair of control hmrds (Figures 6 reach of a single operator. Thc valves controlling the o ation of tlre hydraulic pump, as xvcll as thosc regiilatiiig tlic hyper-pressure storage cyhiiders, are nroiinie,d on the surroundiig barricade. The leads from all tlrc pyronieter?, or controlling the terupcraturrd the hydraulic pump motor conlroller are mounted together on the clectricnl control board. Temperatures may be measured either by the potsnt,iometer method, by a simdard milli?olt meter, or attaching the therm a recording pyronie For convenience in op ourdon-tube gages are 11 in regulating the hype cornpression cylinders, lied to the catalysts is measthe pi'essure on the ga ured by a mercury gag are tested periodiraily against an apparatu eight type, which is used continuously dm The control of gas rarried out on the mixture circulating through tlie plant is continuously analyzeil by a recording apparatus of the thermal conductivity type. The acouracy of the control of all factors under test in tliiz plant assures the value
