Detroit Advertiser and Tribune (Detroit, MI), 18 Sep, 1877

Mr. O. B. Green, the harbor contractor, has invented a sand pump, which, upon trial, is pronounced the most successful invention of the kind ever known. Mr. Green has expended $60,000 in his experimenting, and now has a boat with his perfected machinery that can do regular dredge work, and do as much work in one day as an ordinary dredge can do in an entire week. At a trial of its capacity on Saturday last, the machine performed wonders, and was pronounced a success beyond all peradventure. Mr. Green is doing work at Sturgeon Bay, and it is the impression that the sand-sucking dredge will do its first regular work there. It is claimed that earth and large-sized stones can be taken up as well as sand.