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TM 5-6640-213-14
NOTE
If a tared weighing boat is used, remove the tare
ring and zero with the empty boat on the pan.
5.  Weighing to a present weight is also a capa-
bility of the balance.  Adjust the weight control knobs and, if
necessary, the micrometer drum knob to the desired value.  Preweigh
step 3., move the arresting lever to the full-release position and
adjust the weight by use of filter paper or a glass rod until the
value is reached.
6.  Correction of the weighing result can be made
for conditions requiring absolute weighings.  The switching weights
are made of noncorrosive, nonmagnetic steel having a density of 7.88
g per ml.  For a medium air density of 0.0012 g per roil, they are
adjusted to match brass weights of density 8.4 g per ml.  Differ-
ential weighings of the same material do not require correction. In
case of absolute weighings, the result of the following formular has
to be added to the weighting result:
=
(1.61 m) - pl/pg + pl/pp
K (grams)
Herein:
=
reading of the
balance in g,
m
=
the density of
the air in g/ml
P1
=
Pg
the density of
the switching weights in g/ml,
=
the density of
the weighing material in g/ml
Pp
(3) Reid Vapor Pressure Apparatus.
(a) Description.  The Reid vapor pressure (RVP)
apparatus (fig. 2-8), designed and constructed to comply with ASTM
test for RVP of petroleum (D-323), is mounted in the far right-hand
corner of the laboratory within the laboratory table.  The apparatus
includes a stainless-steel, constant-temperature bath that is flush
mounted in the tabletop.  Over the  bath are mounted a l/3-horsepower
motor, a thermometer, a 500-watt "low lag" immersion heater con-
trolled by a microset thermoregulator, and brackets for suspending
the bombs.  A standpipe stoppered drain is threaded into the bottom
of the bath.  The line switch, pilot light and electronic relay are
mounted on a bar under the tank section of the bath assembly.  The
thermoregulator is adjustable.  The maximum current carrying capacity
is 15 milliamperes (ma).
2-23

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