154 



GENERAL SCIENCE 



Gas-connecting hose should be made of flexible metal, and, if 

 desired, coverod with silk or other types of cloth for decorative value. 

 It costs a great deal more to purchase a reliable form of tubing, but 



METAL 



METAL 



TUBING / , 

 CLOTH / TUBIN6 



1. A gas -connecting 

 hose made of paper 

 over a wire spiral. 

 Covered with cloth. 

 3c. to 5c. per foot. 

 Very poor. 



v UNRELIABLE/ 



ATTACHMENT 

 1. 2. 



2. A gas -connecting 

 hose made of a wire 

 spiral. Covered 

 with cloth, lOc. 

 per foot. Fair. 



ATTACHMENT 

 3 4. 



3. A gas - connecting 

 hose made of flexible 

 metal. Covered 

 with cloth and rub- 

 ber. 12c. to 15c. per 

 foot. Excellent. 



4. A gas -connecting 

 hose made of flexible 

 metal. Uncovered. 



FIG. 118. 



<3AS PROOF WOVEN STEEt. 



COMPOUND CLOTH. FIBRE CORE/ 



FIG. 119 Diagram of an Excellent Form of Hose. 



from a hygienic standpoint, and in consideration of the length of 

 time such a tubing will last, it is worth while. 



Burners. The Bunsen burner is chiefly used for heating, light- 

 ing and cooking. 



