OUR TERMS are CASH ON DELIVERY, except by special agreement. Orders from parties not known to us must be accompanied by an advance of at least half the price, or satisfactory City reference. Goods sent by Express will be C. O. D. Where plates are small they may be sent by Mail upon receipt of price and postage. Remittances must be by draft on New-York or P. O. money order, payable to the order of Photo-Engraving Co., or by registered letter--_not by Checks on Local Banks_. We pledge ourselves to meet the reasonable demands of those who employ us. If, in any case, we cannot do so, we will refund the money advanced. _SEND STAMP FOR ILLUSTRATED CIRCULAR_. WROUGHT IRON BEAMS & GIRDERS [Illustration: WROUGHT IRON BEAMS & GIRDERS] THE UNION IRON MILLS, Pittsburgh, Pa., Manufacturers of improved wrought iron Beams and Girders (patented). The great fall which has taken place in the prices of Iron, and especially in Beams used in the construction of FIRE PROOF BUILDINGS, induces us to call the special attention of Engineers, Architects, and Builders to the undoubted advantages of now erecting Fire Proof structures; and by reference to pages 52 & 54 of our Book of Sections-- which will be sent on application to those contemplating the erection of fire proof buildings--THE COST CAN BE ACCURATELY CALCULATED, the cost of Insurance avoided, and the serious losses and interruption to business caused by fire; these and like considerations fully justify any additional first cost. It is believed, that were owners fully aware of the small difference which now exists between the use of Wood and Iron, that in many cases the latter would be adopted. We shall be pleased to furnish estimates for all the Beams complete, for any specific structure, so that the difference in cost may at once be ascertained. Address CARNEGIE, BROS. & CO., Pittsburgh, Pa. $5 TO $20 per day at home. Samples worth $5 free. STINSON & CO., Portland, Me. LIGHT GRAY IRON CASTINGS to order promptly. Plain, Bronzed, or Galvanized. We make a _specialty_ of light work. LIVINGSTON & CO., Iron Founders, Pittsburgh, Pa. THE GEORGE PLACE MACHINERY AGENCY Machinery of Every Description. 121 Chambers and 103 Reade Streets, New York. SPARE THE CROTON AND SAVE THE COST. DRIVEN OR TUBE WELLS furnished to large consumers of Croton and Ridgewood Water. WM. D. ANDREWS & BRO., 414 Water St., N. Y. who control the patent for Green's American Driven Well. PATENT RIGHTS for Useful Inventions Wanted. Address Box 1012, P.O., N. Y., with description and terms. TO ELECTRO-PLATERS. JEWELERS, AND WATCHMAKERS. BATTERIES, CHEMICALS, AND MATERIALS, in sets or single, with Books of instruction for Nickel, Gold, and Silver Plating. THOMAS HALL, Manufacturing Electrician, 19 Bromfield Street, Boston, Mass. Illustrated Catalogue sent free. LATHES, PLANERS, SHAPERS, DRILLS, GEAR & BOLT CUTTERS, &c. E. GOULD, Newark, N. J. SELF-ACTING SASH-LOCK for Meeting Rails [Illustration: Sash-lock]