the operating characteristics based on partial tests 
completed. The new apparatus is working fairly well. 
Description of the New Apparatus: The apparatus 
consists of a main boiler, BZ, in which the test solution 
is boiled by a 2 Kw wire heater, Hz. Approximate capacity 
of Bz 15 3.5 liters. Vapor rises. through the central tube 
of condenser C, into the vapor space V, then passes down- 
ward into condenser C, where it condenses, and then collects 
in the condensate collector, E. the top of the. condensate 
collector is connected to the pressure controller. The 
condensate from the collector can be channeled) tor eather or 
both of the thermometer legs, L, or L,, through tubes A, and 
Az and valves Vj and Vz. For normal mode of operation, V2 
is closed and condensate flows into Lj and then through tubes 
A13(to pump Pj) and Az (through valve Vz to the main boiler, 
B3. Usually a small liquid head is maintained over the 
bottom plate of leg Lj, so that the pump, Pj, remains 
primed. Py pumps the condensate through flowmeter, Fj, into 
preborler, (By, fvtted with heater, H, (200 watts). 
Thermometer ,Tj,is inside a housing, Gj], which is inside 
leg Lj. The vapor and boiling condensate mixture falls along 
the inside of G,], and separates at the bottom. The vapor 
passes up through the annular space outside Gj, into vapor 
Space V, and then into condenser C. The condensate mixes 
with the condensate coming from E. On the other side, with 
valve V7 closed, boiling solution from Bz is pumped by P? 
through flowmeter Fy, through preboiler By (fitted with 
heater Hz, as in case of preboiler By. The mixture of 
boiling solution and vapor passes through passage R>, along 
the thermometer Tz, inside G,. At the bottom, the vapor 
solution mixture separates. the vapor flows back to the 
condenser in a manner similar to that of the vapor from 
leg Ly. The solution accumulating at the bottom of L2 
passes through sampler S, and overflow tube As, into 
main boiler Bz. The sampler can be withdrawn from line 
after some time, without disturbing the system, by closing 
the valves Vo, Vio> Na and V7. When it is required to 
calibrate the équipiient by running boiling condensate on 
both the thermometers simultaneously, the valves V2 and V7 
are opened, and Vg, Vo; Vig, Vii» V12 closed. Then the 
configuration of the ie Lo ecomes exactly sumilar to 
the configuration of the leg L , and they operate in the 
same way. The valves Vy and V are used to control the 
liquid flow rate over the thermometers. The valve Vs is 
used for draining the system. 
50 
