86 DEPARTMENT BULLETIN 1216, TJ. S. DEPT. OF AGRICULTURE 
4. The burner used with the metal still shall be a ring gas burner, 4 inches 
(100 millimeters) in inside diameter. With the glass flask, an ordinary gas 
burner or electric heater may be used as the source of heat. 
5. The condenser shall be of the water-cooled, reflux, glass-tube type, having 
a condenser jacket not less than 400 millimeters (15% inches) in length with 
an inner tube 12 to 16 millimeters (one-half to five-eighths inch) in diameter. 
The end of the condenser to be inserted in the trap shall be ground off at an 
angle of 60°. 
6. The trap shall be made of well-annealed glass constructed in accordance 
with Figure 38 c, and shall be graduated as shown from to 10 cubic centi- 
meters in 0.1 cubic centimeter divisions. The error of any indicated capacity 
shall not be greater than 0.05 cubic centimeter. 
U-Hol 
nr • "* 
(94-iQmm.i5.lmm.) 
Fig. 3i 
A- - 45 to 55 mm. s l$"to 2^* 
B- (Inside Diameter) 14 » 16 mm. = '.£" » JL U 
C- (Inside Diameter) 12 „ I6mm.= l6 ±" „ f" 
D /50„/70mm.= 6 " 7, 6%" 
£• 25>f38mm.=* f" „ ff m 
F- - /00 n 108mm. » 4 " » 4J? 
H- (Inside Diameter) id » 19 mm.^ %" „ |* 
(a) (ft) (c) 
—Apparatus for uso in tests for water in petroleum products and other 
bituminous materials 
The outside diameters should be preferably 2.5 to 3.5 millimeters (three thirty- 
seconds to one-eighth inch) greater than the inside diameters specified. 
7. (a) The solvent used when testing petroleum products or bituminous ma- 
terials derived from petroleum shall be gasoline free from water and shall 
conform to the following distillation requirements, determined in accordance 
with the standard method of test for distillation of gasoline, naphtha, kerosene, 
and similar petroleum products (serial designation D 86) of the American 
Society for Testing Materials (4) ' 
Five per cent shall distill at a temperature not below 194° F. (90° C.) nor 
above 212° F. (100° C). 
Ninety per cent shall distill below 410° F. (210° 0.). 
