National Geographic : 1918 Sep
Photograph by Paul Thompson OXY-ACETYLENE WORKERS CUTTING STEEL PLATES The oxy-acetylene flame and the electric arc have been potent factors in supplying the United States with tonnage. Through their use the machinery of the damaged interned German ships was quickly repaired. Recently there was launched on the southern coast ofEngland asteel vessel built without rivets. Instead of riveting and calking the plates, they were joined in one process byelectric welding. Itiscomputed from the results obtained on this experimental ship that a saving of 20 per cent could be effected in both time and material ifthe welding process were to supplant riveting.