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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5. BAROMETERS ML-102-B, ML-102-E, and ML-102-F (fig. 1) . a. Frame

and case. These three barometers are shock-mounted in metal frames.

The case is secured to the schockmounts in the frame at the four cor-

ners with screws, washers, and nuts (fig. 10) . The barometer case con-

sists of a kettle-shaped brass housing over which is fitted a circular cast-

ing with four ears for mounting it to the frame. A plastic window in

this casting, held in place by a snap ring, protects the dial. A slotted

screw on the bottom side of the case enables the instrument to be ad-

justed without opening the case. A metal ring is provided at the top

of the frame for hanging the barometer. The back of the case of Bar-

ometer ML-102 -E has a metal rim which holds in place a nomograph

and temperature correction chart.

b. Dial (fig. 2). The dials on the three instruments are identical.

Each is 5, inches in diameter and has three scales. The outer scale is

graduated in fiftieths (0.02) inches, with numerical designations for

whole inches from 26 to 31, and smaller numbers for tenths of inches.

The center scale is graduated in whole millibars from 1085 to 895 milli-

bars. The innermost scale is graduated from 895 to 745 millibars. Every

five millibars bears a numerical designation. In the center of the dial is

a shaft bearing an aluminum pointer which is flattened vertically at

the indicating end., Concentric with the scales and between the inch and

millibar scales is a mirror ring, the purpose of which is to reflect the

pointer and facilitate the reading of the scales (par. 10).

c. Aneroid mechanism (figs. 7 and 8). The aneroid mechanism of

these barometers is built upon a casting which is mounted to a gear

plate, held in place by brackets and screws. The principle of operation

is the same m the three barometers, but the internal mechanism of

Barometer ML- 102-B differs considerably from that of Barometers

M L -102-E and ML-102-F. For a complete description of functioning

of parts of Barometer ML-102-B, see paragraph 16. For Barometers

M L -102-E and ML-102-F, see paragraph 17.

6. BAROMETERS ML-l02-D AND ML-316/TM (fig. 1) . a. Case. These

instruments have identical wooden cases, painted olive drab, with metal

reinforcements at the outside corners. Means for hanging the barometer

temporarily is provided by a sliding metal hanger set flush with the

back of the case. (For preferred position of this barometer, see para-

graph 8C (2).) The lid is fastened to the case by separable hinges and