TM 75053
ML4
1. NOMENCLATURE: Thermometer ML4.
2. TYPE CLASSIFICATION: Standard A.
3. SECURITY REQUIREMENTS: Unclassified.
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
Registers maximum temperature to which it has been
exposed.
5. BRIEF FUNCTIONAL DESCRIPTION:
Thermometer ML4 is a mercury-in-glass thermometer
which indicates the highest temperature to which it has
been exposed after being set. Unlike ordinary mercurial
thermometers, the bore of the stem is constricted near the
bulb so that when the mercury is forced above the con-
striction by a rise in temperature, it cannot readily return
to the bulb. Thermometer ML4 is graduated in degrees
Fahrenheit, and is available in general, tropical, and arctic
temperature ranges.
6. TECHNICAL CHARACTERISTICS:
Type _ _ _ _ _ _ _ _ _ _ _ _ _ Max registering.
Thermal element _ _ _ _ _ _ Mercury.
Temperature range:
General _ _ _ _ _ _ _ _ _ _ 10 F to +125 F.
Tropical _ _ _ _ _ _ _ _ +10 F to +145 F.
Arctic _ _ _ _ _ _ _ _ _ 35 F to +105 F.
Accuracy _ _ _ _ _ _ _ _ _ 0.8 F from 35 F to
0 F ; 0.6 F from 0 F
t o +32 F,; 0.4 F
from +32 F to +125
F.
Graduations _ _ _ _ _ _ _ Intervals of 1, each mul-
tiple of 10 is numbered.
Mounting _ _ _ _ _ _ _ _ Metal frame.
Operating position _ _ _ _ _ _ Bulb approx 5 above the
horizontal.
Weight _ _ _ _ _ _ _ _ _ _ _ _ _ 0.8 lb.
7. MAJOR COMPONENT:
Thermometer ML4.
8. SET, SYSTEM, FACILITY, AND CONFIGURATION
APPLICATIONS:
Thermometer ML4 is used independently.
9. ADDITIONAL EQUIPMENT REQUIRED AND
Support ML54.
10. TOOLS AND TEST EQUIPMENT: None.
11. REFERENCE DATA AND LITERATURE:
Figure 26. Maximum Thermometer ML4.
TM116660-222-12
_ _ _ _ _ _ ML4
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