Wightman and Vaughan's Rock Driller

1848 Scientific American  
We have seen drawings of an apparatue in vented by M r J a m es Callaghan, of New Bed ford, Mass., for the purpose of excavatlDg
doi:10.1038/scientificamerican01151848-132h fatcat:n54qpiguh5bxrg2t7qcambwzwa