264 REVIEW. 



rents; the inductive effect of a Change of Distance 

 of the inducing current; electric currents Induced 

 by Magnets ; Ruhmkorff s Coil ; and the 

 Thermo-electric pile. 



REVIEW QUESTIONS AND EXEECISES. 



1. (.) Give the laws for pressure of liquids, and (&.) explain each 

 by some fact or experiment. 



2. (a.) What is a natural magnet? (&.) An artificial magnet? 

 (c.) How does a magnet behave toward soft iron ? (d.) How one 

 magnet toward another magnet ? 



3. Give the facts in regard to the variation of the magnetic needle. 



4. (a.) What are conductors in electricity? (&.) In what two 

 ways may electrical separation be effected ? 



5. (.) What conditions in the construction and erection of 

 lightning-rods, are necessary to insure safety from lightning? (6.) 

 Give the elements of a simple Galvanic cell, and (c.) the electric 

 condition of those elements within and without the cell. 



6. (a.) A body weighs at the surface of the earth 1014 Ibs.; what 

 would it weigh 1200 miles above the surface ? (&.) Give the velocity 

 of water issuing from an orifice, under a head of 81 feet, (c.) If 

 5 quarts of water weigh as much as 7 of alcohol, what is the 

 specific gravity of the alcohol ? 



7. Find the kinetic energy of a 25 Ib. ball that has fallen 3600 feet 

 in vacuo. 



8. Give the fundamental principle of Mechanics, and illustrate 

 its application by one of the mechanical powers. 



9. (a.) Over how high a ridge can you carry water in a siphon, where 

 the minimum range of the barometer is 27 inches ? (&.) Explain. 



10. (a.) What is Specific Gravity? (6.) How do you find that of 

 solids ? (c.) What principle is involved in your method ? 



11. (a.) How much water per hour will be delivered from an 

 orifice of 2 inches area, 25 feet below the surface of a tank kept full 

 of water, not allowing for resistance ? (6.) Give the law of magnetic 

 attraction and repulsion. 



12. (a.) State what you have been taught concerning the dipping 

 needle. (6.) Define and illustrate magnetic induction. 



13. (a.) Give the law of electric attraction and repulsion, and 

 illustrate by the pith-ball electroscope. (&.) Define conductors and 

 non-conductors, electrics and non-electrics, (c.) Illustrate by an 

 example of each. 



