OBSERVATIONAL LESSON II 



21 



upon the floor just in front of the chosen spot, and on this place the bar of wood 

 upright. Slide the glass along the bar until it is before the eye, and having marked 



its position, fix the two smaller pieces of 

 wood at right angles to the bar (see 

 figure 20) so that they project and can 

 be made to carry the glass strip. 



DIRECTIONS TO THE PUPIL 



(2) If the sun is not shining, 

 the alternative subject given be- 

 low is to be proceeded with 

 (page 23). 



Otherwise, at noon one observer 

 must look through the glass at 

 the sun, and a second should make 

 a mark on the window pane at 

 the place where the sun is seen 

 to shine through it by the first 

 student, according to his instruc- 

 tions. 



The date must be added. 



On a left hand page write a 

 brief description of the way 

 in which the mark was made 

 on the window. 



LINES 



show the 

 he uilii of 

 theSUN 

 at NOOh 



-SER28 MAR.H 

 -OCTIO MAR 

 - OCT.2S 



FIGURE 22. 



