20 FIRST YEAR COURSE IN GENERAL SCIENCE 



Make three observations at least three hours apart each 

 day for a week. If you have access to a barometer, give its 

 reading also. 



RESULTS 



State the relation (if any) shown by the record between - 



1. The temperature and the time of day. 



2. The condition of the sky and the wind. 



3. The condition of the sky and rain. 



4. The direction of the wind and rain. 



5. Why is it necessary that the thermometer should not 

 be in contact with the wall of a building? 



EXERCISE XIII (Textbook 127) 

 VARIATIONS IN TEMPERATURE SHOWN BY CURVES 



APPARATUS: A thermometer hung out of doors not in 

 contact with a warm wall of a house, and not in the sun- 

 shine; a sheet of coordinate paper at least 16 X 20 cm. 

 ruled in 2 mm. spaces, with heavy rulings 1 cm. apart. 

 (This can be procured from dealers in draughtsmen's 

 supplies.) 



DIRECTIONS FOR WORK: 



(1) Prepare the paper by dating the heavy vertical lines 

 with 15 consecutive dates, placing at the left the date of 

 first observation. Place the number of degrees at the left 

 end of the heavy horizontal lines. If in the winter season 

 north of the 40 latitude, let -20 F. be the lowest; if south 

 of 40, let 10 F. be the lowest; and number up by succes- 

 sive fives. If in summer, begin with 30 at the lowest line. 



(2) Read the thermometer at what you consider the 

 warmest part of the day, and make a dot at the intersection 

 of the date line and the line of the degree read. Place 

 another dot on the same date line at the line of lowest tem- 

 perature which you can observe for that date (probably in 

 evening). Repeat for each date for two weeks or more. 



