2. Q. What are the fireman's duties on arrival at enginehouse previous
to going out on a locomotive?

A. He is required to examine the bulletin board, guards on water and
lubricator glasses; try gauge cocks to find true water level; then
examine grates, ash-pan, flues and fire-box. Put fire in proper shape;
see that a proper supply of firing tools, water, coal, oil and waste are
provided, that all lamps and markers are filled, cleaned and in proper
condition; and to perform such other duties as may be required by the
engineer to assist him in getting the engine in readiness.

3. Q. What pressure is indicated by the steam gauge? What is meant by
atmospheric pressure?

A. The pressure per square inch inside of the boiler. Atmospheric
pressure is the pressure represented by the density of the atmosphere in
pounds per square inch, which is at sea level 14.7 pounds.

4. Q. On what principle does a steam gauge work?

A. The steam gauge pointer is actuated by a flattened or bent round tube
to straighten itself under the pressure of steam against the water
inside of tube. The gauge pointer receives movement from suitable
mechanism connected with the tube.

5. Q. What is the source of power in a steam locomotive?

A. Heat is the source of power in all steam engines. It is necessary to
have fuel and water. When fuel is burned, the water coming in contact