Field, laboratory, and library manual in physical geography . aying that it was made in the field. Part II Refer to the map, Fig. 12. Use cross-section paper and drawthe profile along an imaginary line extending from A to B. Usethe same horizontal scale as is used on the map; vertical scaleone square to 100 feet. Make a rectangle around your drawingand put figures in the proper places to indicate the ends of the profile with letters indicating the properdirections. Give your drawing a title, telling from what kindof map it is made. State vertical and horizontal scales. EXERCISE
Field, laboratory, and library manual in physical geography . aying that it was made in the field. Part II Refer to the map, Fig. 12. Use cross-section paper and drawthe profile along an imaginary line extending from A to B. Usethe same horizontal scale as is used on the map; vertical scaleone square to 100 feet. Make a rectangle around your drawingand put figures in the proper places to indicate the ends of the profile with letters indicating the properdirections. Give your drawing a title, telling from what kindof map it is made. State vertical and horizontal scales. EXERCISE XXXI THE WEATHERING OF ROCKS Part I Use a brass ball and a ring which is just large enough to slipover it readily. Heat the ball in the flame of the Bunsen to put it through the ring. What change has occurred?Account for this change. Let the ball cool and try again. Whatchange do you observe ? What effect has heat upon brass ? Use the apparatus consisting of a freely moving lever, with atense rubber string on the long arm and an iron wire on the. o 103 104 PHYSICAL GEOGRAPHY MANUAL other. (See Fig. 13.) Heat a portion of the wire by burning amatch under it. What effect has heat upon iron ? How do ironand brass act upon cooling ? What effect do you suppose heat would have upon a rock ?How would a rock probably act upon cooling ? Do rocks exposedon hillsides suffer change of temperature ? How warm do rocks
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