. Scientific American Volume 51 Number 15 (October 1884) . ST E M WIN DIN G l%lT.\?i^^.l°^. tertwo year?public use, this lock is claim-ed to be unplckable. May be set on any 1,2,3, or 4 of Its 50 dial numbers. Unlike anyother lock. Millions of changes of combi-nation available. Sample mailed on receiptot Send stamp f(jr list of fine Lock Co., Philadelphia, Pa. THE SEVERN TUNNEL. — DESCRIP- tlon of the great tunnel under the Severn, betweenEngland and Wales. Method of construction. Difficul-ties encountered. Present progress of the work. Con-tained in Scientific Ameuican Sup
. Scientific American Volume 51 Number 15 (October 1884) . ST E M WIN DIN G l%lT.\?i^^.l°^. tertwo year?public use, this lock is claim-ed to be unplckable. May be set on any 1,2,3, or 4 of Its 50 dial numbers. Unlike anyother lock. Millions of changes of combi-nation available. Sample mailed on receiptot Send stamp f(jr list of fine Lock Co., Philadelphia, Pa. THE SEVERN TUNNEL. — DESCRIP- tlon of the great tunnel under the Severn, betweenEngland and Wales. Method of construction. Difficul-ties encountered. Present progress of the work. Con-tained in Scientific Ameuican Supplkmknt, * Price 10 cents. To be had at this office, and fromall newsdealers. Revolvers.* Jlifles, ^. THE HOLLAND LUBRICATOR, VI^TRTTi: 1>KOI> Is guaranteed to be!■ A perfect insuranceaeainBt the cutting ofValve-sealB, Cylinder andGovernor Valves ot theengine. S. It will pay lor itaeltIs six month B,in the savingof oil, coal, and packing. 3. It will iuaure moreBpeed in the revolutions oftne engine,Bay from one totwo strokes f>er minute,thus increasing the powerof theenglDe. UfdbvHoUaiid A Thompson, J n River St., Troy,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectaddress, bookyear1884
