DIFFERENCES IN BAROMETERS

Section I. Restircted Description

BAROMETERS ML-102-B, ML-102-E, and ML-102-F

TM-11-427 Barometers ML-102-B ML-102-E ML-102-F ML-102-G and ML-316/TM Manual
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b. Barometers ML-102-D and ML-316/TM. (a) Pressure sensitive

cell.

(b) Lever system

(2) Case. (a) Wooden base and lid.

(b) Dial.

(d) Temperature correction and conversion chart.

(3) Carrying case with strap.

3. DIFFERENCES IN BAROMETERS. a. Barometer ML-102-B (fig. 1).

Externally, Barometer ML-102-B is identical to Barometer M L -102-F.

Both are contained in black metal cases and leather carrying cases. The

internal mechanism of Barometer ML-102 -B, however, differs from

all other models, for it has five pressure cells and a more complicated

lever system (par. 16).

b. Barometer ML-102-E (fig. 1). The case of Barometer ML-102-E

is of metal, painted dark green, with a crackle finish. It has a solid back

provided with a metal rim which holds a nomograph and temperature

correction chart, calibrated specifically for each instrument. This model

has two pressure sensitive cells (for complete description see par. 17) .

c. Barometer ML-102-F (fig. 1). The exterior of this model iS identi-

cal to that of Barometer ML-102 -B. The interior is identical to that of

Barometer ML-102-E.

d. Barometer ML-102-D. This barometer differs both in appearance

and construction from other Barometers ML-102 -(*). Externally it is

housed in a square wooden case; the internal mechanism contains only

one pressure cell. It is of much lighter construction than Barometers

M L -102 B, ML-102 -E, and ML-102 - F .

e. Barometer ML-316/TM. This model is identical to Barometer

M L -102-D in appearance and construction, differing only in the range

of pressure (par. 4b).

4. CHARACTERISTICS. a. Essential components of aneroid barometer.

The aneroid barometers covered in this manual consist of the follow-

ing parts:

(1) An almost completely. evacuated metal cell (or cells) sensitive

to changes m the atmospheric pressure.

(2) A system of levers and gears by which the motion of the cell is

magnified and transmitted to a pointer. The cell and lever system is

hereafter referred to as the aneroid mechanism,

(g) A dial on which the pointer indicates the changes or pressure.

b. Pressure range. (1) Barometers ML102 B, ML102 E, and

M L -102-F. The range of pressure of these instruments is 1085 to 745

millibars and 31.5 to 22 inches. The dials are graduated in both milli-

bars and inches.

(2) Barometer ML-102 -D. The range of pressure of this barometer

is 1065 to 745 millibars. The dial is graduated in millibars only.

( 3 ) Barometer ML- 3 1 6 /TM. The range of pressure of this bar-

ometer is 1065 to 610 millibars. The dial is graduated in millibars only.

c. Dimensions and weight. The following tables gives the dimensions

and weight of the barometers covered in this manual:

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