Entirely _Fireproof_, undecaying, and the best _non-conductor of heat, cold, or sound_. Cheaper than hair-felt. =A. D. ELBERS=, _P. O. Box 4461._ 26½ Broadway, N. Y. ---------------------------------------------------------------------- [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, 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. ---------------------------------------------------------------------- =Pond's Tools=, =Engine Lathes, Planers, Drills, &c.= Send for Catalogue. DAVID W. POND, Successor to LUCIUS W. POND. =Worcester, Mass.= ---------------------------------------------------------------------- =$3 GOLD PLATED WATCHES.= Cheapest in the known world. _Sample Watch Free to Agents._ Address, A. COULTER & Co., Chicago. ---------------------------------------------------------------------- =EAGLE FOOT LATHES,= [Illustration] Improvement in style. Reduction in prices April 20th. Small Engine Lathes, Slide Rests, Tools, etc. Also Scroll and Circular Saw Attachments, Hand Planers, etc. Send for Catalogue of outfits for Amateurs or Artisans. WM. L. CHASE & CO., 95 & 97 Liberty St., New York. ---------------------------------------------------------------------- =The George Place Machinery Agency= =Machinery of Every Description.= 121 Chambers and 103 Reade Streets, New York. ---------------------------------------------------------------------- CIVIL and MECHANICAL ENGINEERING