^C5^ JAOaGS ItJAV 



275 



7. Revolving hood, containing intensifier and hardened steel frictionless bearing. 

 This bearing is entirely protected from the elements and no rain, snow or ice can inter- 

 fere with the motion of the hood. 8. Opening into intensifier. 



9. Heavy galvanized storm bands, stiffened greatly by ornamental beading. This 

 band with skirts inside keeps out rain and snow. 



1 0. Heavy steel wiring, amply strengthening storm band and all skirts. 

 1 1 . Skirt greatly assists in aiding the circulation of air. 



12. Heavy galvanized steel body strengthened by galvanized steel angle irons which 

 are thoroughly braced. (See Fig. 3, page 272.) 



I 3. Special alloy non-corrosive rivets, used throughout entire structure. 

 14. Heavy galvanized steel body strengthened by standing seams (15). 

 1 6. The fastening at this point is the strongest possible, extra heavy galvanized angles 

 to which the body is securely bolted by special non-rusting bolts and nuts. 

 1 7. Heavy galvanized steel cornice, made by us from our own designs. 

 18. Corners are made from extra heavy galvanized steel. Folded and locked into 

 side and top sheets to form a solid and tight structure. 



20. Galvanized steel flashing, so constructed as to leave the least work for the 

 workman placing the ventilator on the roof. 



Four long bolts, with nuts and washers, are furnished to bolt ventilator to the roof. 

 All openings are protected by galvanized bird-proof netting. 



Lightning rods should be coursed around the ventilators — never through a ventilator. 

 A bond should be made between the rod and ventilator, preferably by soldering rod to 

 outside corners of base, making a permanent positive metal contact. 



