47 



EXPERIMENT 37. loOTHERMAL LINES 



Make an outline map of the United States and locate the 

 following large cities approximately : 



(i) Bangor, Me. (2) Boston, Mass. 



Montpelier, Vt. Albany, N.Y. 



Saginaw, Mich. Buffalo, N.Y. 



Milwaukee, Wis. Detroit, Mich. 



St. Paul, Minn. Madison, Wis. 



Pierre, S.D. Denver, Col. 



Cheyenne, Wy. Salt Lake City, Utah. 



Yellowstone Park, Wy. Boise City, Idaho. 



Spokane Falls, Wash. Olympia, Wash. 



(3) Annapolis, Md. Sante Fe, N. Mex. 



Knoxville, Tenn. Phoenix, Ariz. 



Frankfort, Ky. Santa Barbara, Cal. 



St. Louis, Mo. San Francisco, Cal. 

 Topeka, Kan. 



The cities in the first group have a mean temperature 

 of 44 ; those in the second group a mean temperature of 

 48; and those in the third 58. With a sharp pencil 

 draw dotted lines connecting those cities which have the 

 same mean temperature. These lines are called isotherms. 



EXPERIMENT 38. BAROMETRIC CURVE 



Note and record the barometer reading in the laboratory 

 at the same time each day for two weeks. Draw a curve 

 which will show the variation in the barometric pressure for 

 that time, using distances above OX to denote pressures, 



