THE ARTS AND INDUSTRIES. VIII. 



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



a. The arts. 



b. The industries. 



81. Metals. (See Section 6.) 



a. The common metals. 



b. The rare metals. 



c. Obtaining metals from the ores. 



Experiment 69. The reduction of an ore. 



82. Illuminating gas. 



a. Coal gas. (See Section 9.) 



Experiment 70. How to make coal gis 



b. Water gas. 



Experiment 71. How to make water o-r\s. 



83. How newspaper cuts are made. (See Section 17.) 



84. Motion pictures. (See Section 18.) 



Experiment 72. The theory of motion 

 pictures. 



85. The phonograph. (See Section 23.) 



86. Steel. 



a. Composition. (See Section 26.) 



b. Tempering. 



Experiment 73. Tempering steel. 



87. Fireless cookers. (See Section 27.) 



88. Dyeing. (See Section 44.) 



a. Silk and wool. 



b. Cotton and linen. 



Experiment 74. Dyeing. 



89. Tanning of leather. (See Section 46.) 



90. Bleaching. (See Section 46.) 



a. Natural. 



