c. Tracings of drawings may be duplicated by 

 blue print paper. 



Experiment 68. Blue printing from 

 tracings. (See Section 70.) 



63. The pendulum. 



a. The weight of the bob makes no difference 

 in the number of swings per minute. 



b. The effect of length. 



Experiment 69. The simple pendulum. 



64. Forces. 



a. Pushes and pulls. Elasticity. 



Experiment 70. Weight is a pull. 



b. Pressure is the push on a certain surface. 



65. The lever. (See Section 79.) 



Experiment 71. The use of a lever. 



66. The inclined plane. 



Experiment 72. The use of the inclined 



plane. 



(These subjects, Mechanics, are continued in 

 the work for the sixth grade.) 



MAGNETISM AND ELECTRICITY. V. 



67. The lode stone. 



68. Steel magnets. 



a. Attraction. 



Experiment 73. Magnetic materials. 



b. The space around a magnet. 



Experiment 74. To draw a magnetic 



field. 

 Experiment 75. Blue prints of magnetic 



fields. (See Section 70:) 



