PHYSICS
What peculiar advantages has mercury for use in thermometers? 1901.
How do the Fahrenheit and Centigrade thermometers differ? 1901.
What other thermometer is also used? 1592.
What is a pyrometer? 1567.
Describe the two pyrometers now in use? 1567.
What are the only two methods known far the,transfer of heat? 855.
Upon what four things does the flow of h«at through a solid body depend? 855.
How does convection differ from conduction? 855.
What remarkable similarity exists between light and radiant heat? 855.
What is radiant energy? 1579.
How does heat differ from radiant energy? 1579.
What instrument detects the radiation from a candle two miles away from it? 1580.
What are the three most important effects of heat? 855.
What is the coefficient of linear expansion? 855.
How much does the volume of a solid change when heated? 855.
What was the term caloric formerly used for? 311.
How do ice and water use up heat in melting and evaporating? 856.
How is the unit of heat denned? 856.
What is the specific heat of a substance? 856.
What is the heat of fusion? 856.
What ,is meant by the vapor-tension of any substance? 636.
What is sublimation? 636.
How may the boiling point be denned? 636.
What is distillation? 535.
LIGHT.
When does light travel in straight lines? 1067.
What is the phenomenon of reflection? 1067.
When is a ray of light said to be refracted? 1067.
What is the index of refraction? 1067.
Does light travel at the same rate of speed in all kinds of matter? 1068.
When are two rays of light said to "interfere"? 1068.
What did Newton prove regarding the composition of a ray of white light? 1068.
If a ray of light is passed through a crystal of Iceland spar, what is the result? 1065.
Why do we believe light to be a wave motion of the ether? 1068.
GRAVITATION. What is gravitation? 796.
When and by whom was this law discovered? 796. What are the three principal facts known concerning gravitation? 797. What is the name given to the summary of these laws? 797. What important inferences may be drawn from this law? 797.
ELASTICITY. What is elasticity? 593.
When are forces said to be in equilibrium? 593. What is the meaning of the terms "stress" and "strain"? 593. How is the elasticity of length measured? 593. How is the elasticity of volume computed? 594. How is the elasticity of shape found? 594. Which of these kinds of elasticity is employed in dividing bodies into
solids and fluids? 594. When are bodies said to be rigid? 594.
ELECTRICITY.
How did the word "electricity" originate? 596. In 600 B. C. what facts were known concerning electricity? 596. During the next two thousand years, was any advance made in the
science? 596.
What is the science of electrostatics? 596. What is the first law of electrostatics? 596. What is a "conductor"? 596. What is a "non-conductor"? 596. What are the two kinds of electrification called? 596.
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