280 



THE WORLD'S ADVANCE 





Tandem Teams of Tugs Trying to Pull the "Zeelan d" Off the Mudbank. There Were Ten of These 

 Boats at Work, Among Them the Largest Sea-Going Tugs in the World, Represent ng a Total Pull of 



14,000 Horsepower. 



went his teacher one better by substitut- 

 ing another seal-breaking medium. As 

 soon as the Zeeland was out in deep 

 water, it took but a little while to break 

 the hose connections, to withdraw the 

 pipe fittings, and to replug the holes from 

 within the ship. Thus was she made 



absolutely secure without going into dry- 

 dock, no time was lost, and when she 

 reached Montreal she was ready to take 

 on freight and load up for the return 

 voyage to England. This she did, and 

 she left the waters of the St. Lawrence 

 before the gathering of the ice. 



WELDING FOUR THOUSAND FEET 

 OF GAS MAIN 



There has recently been completed 

 at New Bern, N. C, the task of welding 

 four thousand feet of four-inch gas main 



by means of 



oxy - acetylene 

 torches. 



A c e t y lene 

 gas was sup- 

 plied the 

 torches from 

 100 . and 300. 

 cubic foot, cyl- 

 inders, and 6x- 

 ygen from 100 

 and 200 cu- 

 bic foot cyl- 

 inders. The 

 contractors in 

 charge of the 

 work found 

 that with rea- 

 sonable care as 

 to waste it was 



The Modern Way of Laying Gas Pipe is to Weld the Separate 

 Lengths Together So as to Form One Continuous Piece of Metal. 



possible to obtain twenty or more four- 

 inch joints with each 100 cubic foot cyl- 

 inder of oxygen, and twenty-five or more 

 four-inch joints with each 100 cubic foot 

 cylinder of acetylene gas. It was also 

 found that the welds could be made fast- 

 er a n d better 

 when working 

 in t h e trench 

 than on the 

 level ; the rea- 

 s o n offered 

 being that the 

 torch draws an 

 excess of oxy- 

 gen from the 

 air when burn- 

 ing in the wind 

 and causes a 

 tendency t o 

 burn the filling 

 material. This 

 difficulty 

 would not oc- 

 c u r on larger 

 sized mains. 



