How did the actions of Frederick Douglass contribute to the success
of the Union during the Civil War

By 1860, Douglass was well known for his efforts to end slavery and his skill at public speaking. During the Civil War, Douglass was a consultant to President Abraham Lincoln and helped convince him that slaves should serve in the Union forces and that the abolition of slavery should be a goal of the war.

Explanation:

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http://www.americaslibrary.gov/aa/douglass/aa_douglass_war_1.html

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.