Experiment 68. Tricks based upon in- 

 ertia. 



83. Velocity. 



a. Speed indicators. (See Section 88.) 



Experiment 69. How to make a speed 

 indicator for the wind. 



b. Momentum. 



Experiment 70. Examples of momentum 

 (These subjects, Mechanics, are continued in the 

 work for the seventh grade.) 



MAGNETISM AND ELECTRICITY. VI. 



84. A brief summary of the facts stated under the 



same topic in the work for the fifth grade. 



85. Magnetic effects of electricity. 



Experiment 71. How to make an elec- 

 tric magnet. 



86. Applications of magnetism due to electricity. 



a. The electric bell. 



Experiment 72. How to make an elec- 

 tric bell. 



b. The telegraph. 



Experiment 73. How to make a tele- 

 graph instrument. 



c. The electric motor. 



Experiment 74. How to make an elec- 

 tric motor. 



(These subjects, Magnetism and Electricity, are 

 continued in the work for the seventh grade.) 



THE ARTS AND INDUSTRIES. VI. 



87. Man's applications of nature's principles. 



88. Weather instruments. (See Sections 41, 42, 45, 



and 83.) 



