180 SIPHON. 



2. If a lifting-pump can just raise water 28 ft., how high can it 

 raise alcohol having a specific gravity of 0.8 ? 



3. Water is to be taken over a ridge 12.5 m. higher than the sur- 

 face of the water, (a.) Can it be done with a siphon? Why ? (6.) 

 With a lifting-pump ? Why V (c.) With a force-pump ? Why ? 



4. How high will bromine stand in an exhausted tube, when mer 

 cury stands 755 mm.t (Sp. gr. of bromine = 2.9G.) 



5. If water rises 34 feet in an exhausted tubo, how high will 

 sulphuric acid rise under the same circumstances ? 



6. The sectional area of the piston of a " weight-lifter" being 15 

 sq. inches, what weight could the instrument raise ? 



7. If the capacity of the barrel of an air-pump is \ that of the re- 

 ceiver, (a.) what part of the air will remain in the receiver at the 

 end of the fourth stroke of the piston, and (b.) how will its tension 

 compare with that of the external air ? 



8. How high could a liquid with a sp. gr. of 1.35 be raised by a 

 lifting-pump when the barometer stands 29.5 inches ? 



9. Over how high a ridge can water be continuously carried in a 

 siphon, the minimum standing of the barometer being 09 cm. ? 



10. What is the greatest pull that may be resisted by Magdeburg 

 hemispheres (a.) 4 inches in diameter? (&.) 8 cm. in diameter? (See 

 Appendix A.) 



. Recapitulation* In this section we have considered 

 the Air-pump ; the Limits of Exhaustion at- 

 tainable by the ordinary air-pump ; Sprengel's and 

 Bunsen's air-pumps; the Condenser and Trans- 

 ferrer; numerous Experiments pertaining to aeri- 

 form pressure and tension; the Lifting-pump; the 

 Force-pump; the Siphon and Intermittent 

 Springs. 



EEVIEW QUESTIONS AND EXERCISES. 



1. Define (a.} Physics, (& ) Chemistry, (c.) Atom, (d.) Molecule, (e.) 

 Solids, (/.) Liquids and (g.) Aeriform Bodies. 



2. Define (a.) Inertia, (&.) Impenetrability and (c.) Hardness, illus- 

 trating each by examples. 



3. (.) Define Momentum and (&.) Energy. A body weighs 500 

 Ibs., and has a velocity of 60 ft. per second ; (c.) what is its momen 

 turn and (d.) what its energy ? (e.) How would each be affected by 

 doubling the weight ? (/.) By doubling the velocity ? 



