Contents. xv 



CHAPTER XXIIL 

 FARM MACIJINEBY. 



PAQB. 



FBICTIOW e 53f 



Friction between solids, p. 638 ; Friction of rest or static friction 

 between solids, p. 539 ; Friction of motion between solids, p. 

 539; Rolling friction, p. 540; Friction between liquids, p. 549; 

 The action of lubricants, p. 541 ; Adaptation of lubricant to 

 place of service, p. 541; Scrupulous cleanliness of bearings, 

 p. 542 ; Hot boxes, p. 543. 



BELTING 643 



Action of belting, p. 543 ; Efficiency of belting, p. 543 ; Size of belt 

 for transmission of given horse power, p. 544 ; Condition of 

 belt, p. 544 ; Pulley and shaft, p. 545 ; Lacing a belt, p. 545 ; 

 Calculating the lengths of belts, p. 546. 



FABM PUMPS ^ 546 



Suction pump, p. 546; Size of* piston, p. 547; Rate of pumping, 

 p. 548 ; Relation of size of suction and discharge pipe and pis- 

 ton to power required to work the pump, p. 548 ; Influence of 

 elbows on the power required to work a pump, p. 550 ; Double- 

 acting suction pumps, p. 550 ; Proper place for the cylinder In 

 the well, p. 551. 



HYDRAULIC RAM 553 



PRINCIPLES OF WEATHER FORECASTING. 

 CHAPTER XXTV. 

 THE ATMOSPHEKO. 



RELATION TO THE EARTH 654 



Interpenetration of the three spheres, p. 555 ; Relation of the life 

 zone, p. 555. 



ATMOSPHERE 656 



Depth, p. 556 ; Composition, p. 556 ; Materials mechanically sus- 

 pended, p. 557. 



PABTS PLAYED BY THB DIFFERENT INGREDIENTS 657 



Oxygen, p. 557; Nitrogen, p. 658; Water; p. 558; Dust, p. 558; 

 Carbon dioxide, p. 558. 



ATMOSPHERIC PRESSURE 559 



Applications of pressure, p. 559. 

 TEMPERATURE OF THB ATMOSPHERE 560 



CHAPTER XXV. 



MOVEMENTS OF THB ATMOSPHEBB. 

 PBIMABT CAUSE OF WINDS 601 



