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PHYSICS

How does a condensing engine differ from a non-condensing engine? 1817.

How does the Parson's turbine engine differ from De Laval's? 1953.

Which of them makes 15,000 revolutions per minute? 1953.

In what two ways only may the efficiency of a turbine engine be increased? 1953.

Who invented the link motion used on locomotives? 1817.

What locomotive showed a speed of 30 miles an hour in 1829? 1817.

What is the steam-hammer? 1818.

When and by whom was the screw propeller introduced? 1818.

Who made a successful experimental boat in 1801 using a screw propeller? 1711.

What ocean steamship uses 570 tons of coal per day? 1819.

What study treats of the properties of gases? 1508.

How was the first gas engine operated? 739.

How does the gas engine compare with the steam engine in efficiency? 740.

What gas motor has given the highest efficiency of any form of heat engine? 740.

What is the pressure of the atmosphere? 33.

What is the height of the atmosphere? 34.

Who showed that "nature abhors a vacuum because the air has weight"? 174.

What is the aneroid barometer? 174.

How does a force pump differ from a vacuum pump? 34.

What vacuum pump can reduce the pressure of a closed vessel to the one hundred millionth of an atmosphere? 35.

What degree of vacuum can be produced with an ordinary air pump? 1997.

At what temperature and what pressure will air become a liquid? 438.

What two fluids result from liquefied air? 1078.

What enormous pressure can liquid air exert during evaporation? 1079.

What is the manometer used for? 1161.

What fact is known as Boyle's law? 255.

What fact is described by the law of Charles? 370.

ACOUSTICS.

What subject is studied under acoustics? 8. What two things are essential to the production of sound? 8. How is the pitch of a string determined? 8. What is the frequency of a note? 1495.

What evidence have we that sound is a wave motion in the air? 8. What is a wave motion? 2058. How did Newton use the echo to determine the speed of sound in air?

579.

How may two sounds produce silence? 8. Does the pitch of a sound affect its speed? 8. How fast does sound travel in air? 8. How does sound help to determine the number of atoms in a molecule

of gas? 8.

What is the manometer flame used for? 1162. How does a "musical tone" differ from a "noise"? 8. What determines the loudness, the pitch and the quality of a musical

tone? 9.

What is a musical interval? 9. When are two notes in unison? 9. What is an octave? 9.

What is a remarkable fact about the ears of all western nations? 9. What is the musical scale made up of? 9.

HEAT.

What are the two fundamental questions regarding a thermal condi-


 * tion? 854.

How does Maxwell define temperature? 855. When are bodies said to have equal temperatures? 1886. What are the essential features of a good thermometer? 1901.

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