OF CERTAIN SALTS IN TERNARY MIXTURES. 



121 



MM'// D OOO 



"OOOO 



FIG. 52. Constant Temperature Apparatus for Conductivity and Viscosity Investigations. 



A. Sixty-liter bath of 20-oz. copper: (A) Asbestos insulation; (B) sheet-brass cover; (c) woven-wire grid; (D) 



semicircular diaphragm ; (E) deflector to divert part of the water into heater pipes; (F) thermometer; (G) 

 tripod; (H) galvanized-iron heater pipes attached with 1^-inch brass nipples; (i) brass bands supporting 

 insulation; (j) outline of windows. 



B. Thermostat: (K) Holder; (L) toluol reservoir tubes with j mm. walls; (M) expansion chamber partially filled 



with mercury; (N) 1.5 mm. capillary; (o) side arm with sealed-in platinum contact; (P) platinum tipped 

 contact needle. 



C. Gas-flow regulator (based on "steel block" devised by E. E. Reid, Amer. Chem. Journ., 1909, 41, 151): (Q) 



Binding posts to coils; (R) magnet coils; (s) armature; (T) steel valve chamber; (u) plunger with rubber 

 washer and mercury seal working against end of gas-supply pipe (v) and wired to armature (s) ; (w) needle 

 valve to regulate size of pilot flame; (x) micro-burner with needle valve; (Y) gas-cocks to relay and rough 

 heater (z) ; (zz) high-voltage lamp spanning spark-gap of thermostat. 



D. Stirring mechanism: (AA) Shaft; (BB) [^-shaped bracket; (cc) oil cups and bearings; (DD) pulley with oil trap 



filled with waste; (EE) oil trap; (FF) six-bladed propeller. 



E. Cooling system: (GG) Standpipe; (HH) supply; (n) overflow; (jj) petcock in cap; (KK) regulating valve to 



coils; (LL) inlet pipe to coils; (MM) interchangeable unions (here ice or hot water coils may be inserted for 

 very low or high temperatures) ; (NN) cooling coils ; (oo) waste pipe. 



F. Diagram of top (smaller scale) : (B), (D), (F), (H), (j), and (K) the same as in A; (MM) same as in E; (PP) aper- 



tures in cover for conductivity cells; (QQ) lugs supporting cover; (RR) handle to removable section of cover. 



