The SciencesThe Twentieth-Century Lumber-JackSome of the Machines and Methods Which Were Not at the Disposal of His GrandfatherBy J. F. Springer on July 10, 1920AdvertisementABOUT THE AUTHOR(S)Recent Articles by J. F. SpringerCoal Piles that Light ThemselvesStudying Fire Risks from Sample FiresSome Great Dredges