CHAPTER VI.

HOSE.

Early Types Made of Canvas-Wound Rubber Tubing 80 Standard Weight Adopted 80 First Type Produced Especially for Use in Vacuum Cleaning Work 81 First Attempt to Produce Light-Weight Hose 81 Other Types 82 Hose Couplings 82 Hose Friction 84 Effect of Hose Friction 88 Most Economical Hose Size for Carpet and Floor Renovators 93 Conditions for Plant of Small Power 97 Limit of Length for Hose 99