Devices and Helps in Nature Study. 

 The " Weather-pole." 



195 



Do you know what a *' weather-pole " is ? No ? Well, 

 I think every school ought to have one. No, it is not a 

 flagpole. Can you not guess ? Does the name give you no 

 hint ? Oh, yes ; it is because the pole tells something about 

 the weather. How ? We shall see how ; but first we must 

 have a vane to put on the pole. Can one of you boys make 

 us a weather-vane ? How long is this pole ? Yes, about eight 

 feet. At recess we will stand it in the yard. Let us nail it 

 firmly to the south fence. We will go out at noon and see 

 where its shadow will be. Why do we put the weather-vane 

 on the pole ? Yes, we put it there so that we may know how 

 the wind is blowing at any time. What is the reason that 

 we must place the pole at some distance from the house ? 

 Because when the wind sweeps around the corners of the 

 house its direction is often changed. We want to know 

 what direction the wind blows when not turned out of its 

 course by any building or other object. 



Now take a sheet of legal cap and fold it twice so that 

 you will have four leaves. You may use a small memoran- 

 dum or pad instead. If you use paper, fold several sheets 

 as directed and make them into a book. Rule the pages as 

 I do now. 



WEATHER RECORD FOR SEPTEMBER. 



Now we are ready to use our weather-pole. Let us go 

 out at noon and see it. Let us take a thermometer with us 

 and hang it on the shady side of the pole. First let us ob- 

 serve the long shadow which the pole casts on the ground. 

 Henry may drive this stake into the ground just where the 



