南磁極
At age 22 he was selected as chief magnetician on Sir Douglas Mawson's Australasian Antarctic Expedition. Part of his role while based at Cape Denison was to take daily measurements from the Magnetograph House, which he carried out daily regardless of the sometimes difficult conditions. He took part in a sledging journey with Edward Frederick Robert Bage and Frank Hurley to the South Magnetic Pole, a round trip of 960km. Both Cape Webb and Webb Subglacial Trench are named after him.