CONDUCTION 99 



7. Why do woodsmen often wear paper vests? Why do we put 

 newspaper in our shoes to keep our feet warm? 



8. Which of these substances would be best fora stove iron, 

 brick, or soapstone? Why? 



9. How are safes made fireproof? 



10. Why are stove lifters, oven door-handles, etc., made of 

 coiled wire? 



11. Why are dead air spaces left between tne walls of a building? 



12. Why do Eskimos wear one skin with the fur next to the 

 body, and the other with the fur outside? 



13. Why do animals have thick fur in winter? 



14. Why do birds ruffle up their feathers on a cold day? 



15. Why does loosely woven material keep us warmer than 

 tightly woven material? 



16. Why are shawls, sweaters, etc., said to be very warm? 



17. Why does food continue to cook after being placed in a fire- 

 less cooker? 



18. Why is it better to make the outside pail of an ice cream 

 freezer of wood than of metal? 



19. Why does plenty of snow keep the grass roots from freezing? 



20. Why does linoleum feel colder to the bare feet than a woolen 

 carpet? 



21. Why do firemen wear flannel shirts? 



22. Why is it possible to set paper afire with a burning glass? 



23. Why do farmers prefer a winter with abundant snowfall? 



24. Why do rubbers cause the feet to feel very warm if worn in 

 the house? 



25. Why do we use a woolen blanket to cover the ice in summer 

 and to cover ourselves in winter? 



26. Why will the hand on a frosty morning freeze to a metallic 

 surface more quickly than to a brick one? 



27. In taking bread from the oven, why will the hot pan burn 

 your hand wherever it touches you, while the bread and the air 

 of the oven do not, although of the same temperature? 



28. Why may a glass rod be melted in a flame and held in the 

 hand with comfort a few inches from the melting place? 

 29. Why are hob-nail shoes very cold in winter? 



