84. Surveying. (See Section 2.) 



Experiment 77. Levelling with an "A". 



85. Tide motors. (See Section 3.) 



86. Blasting. (See Section 23.) 



87. Gas and gasoline engines. (See Section 23.) 



Experiment. 78. The gas cannon. 



88. Manufactured gas. (See Section 29.) 



a. Coal. 



b. Water. 



Experiment 79. To make water gas. 



89. Vacuum cleaners. (See Section 32.) 



90. Traps in plumbing. (See Section 34.) 



Experiment 80. Different forms of traps. 

 51. Wave motors. (See Section 39.) 



92. Water motors. (See Section 42.) 



a. Water wheels. 



b. Pelton wheels. 



c. Turbines. 



93. Water supply of a city. (See Sections 42 and 4k) 



94. Measurement of water. 



a. Cubic feet and gallons. 



b. Miner's inch. 



95. How to read meters of all kinds. 



96. Lumbering. (See Section 46.) 



97. Clocks. (See Section 73.) 



98. Applications of centrifugal force. (See Section 



77.) 



a. Laundry dryers. 



b. Babcock milk tester. 



c. Cream separators. 



(More applications of science are given in the 

 work for the eighth grade.) 



