Section II. DESCRIPTION AND DATA - TM-9-6685-202-140005

TM 9-6685-202-14

base of the barometer tube to provide a more accurate

Model G is serial numbered 1100 through 1199, model

calibration of the barometer.

H, 1300 through 1799 and model J, 2100 up.

1-5. Forms, Records, and Reports

c. Earlier models may be rebuilt with components

applicable to current models. If variations among

Refer to TM 38-750 for instructions on the use

models cause procedural differences, notes in the text

and completion of all forms required for operating and

will provide alternate data.

maintaining the equipment.

d. Approximately 64 barometers have been

1-6. Reporting of Errors

modified, without regard to any specific serial number

sequence, to provide a higher degree of accuracy for

The reporting of errors, omissions, and

calibration purposes. The modified barometer APN

recommendations for improving this publication by the

7913093, FSN 6660-182-7792, is equipped with a metric

individual user is encouraged. Reports should be

micrometer in the barometer cistern and a 0 to 820-mm

submitted on DA Forms 2028 (Recommended Changes

true-length scale and vernier-set on the barometer

to Publications) and forwarded direct to Commanding

mercury column tube. In addition, a vacuum gage and

General, US Army Missile Command, ATTN: AMSMI-

sensor element with the associated tubing and

MFPB, Redstone Arsenal, AL 35809.

connectors have been added to the top cylinder

mounting disk. A gage block mount is also added to the

Section II. DESCRIPTION AND DATA

and connected to the tube through a passage in the

1-7. Description

base. The barometer is equipped with a compensating

system which compensates and applies corrections for

a. Type A-1. The type A-1 barometer (fig. 1-1)

deviations from standard temperature and gravity. The

consists of a precision bore glass tube rising out of a

various components that comprise the barometer are

fixed cistern. The tube is supported by a frame set on a

located and identified in figure 1-2.

mounting platform. The cistern is also a precision bore

glass cylinder and is mounted on the barometer base

1-2