GENERAL PATENT AGENCY.--The subscriber has established an agency at his warehouse, 12 Platt street, New York, for the protection and general advancement of the rights and interests of Inventors and Patentees. The objects of this agency are more particularly to aid and assist Inventors and Patentees in effecting sales of their inventions and of goods and wares made therewith--and also for the sale and transfer of Patent Rights. Arrangements have been made with a lawyer familiar with the Patent Laws, who will attend to the legal branch of the business upon reasonable terms. Satisfactory references will be given. Applications may be made to the undersigned personally, or by letter, post paid. SAMUEL C. HILLS 45-2dv6* General Patent Agent. * * * * * ENGRAVING ON WOOD. NEATLY AND PROMPTLY EXECUTED AT the OFFICE OF THE SCIENTIFIC AMERICAN, 128 Fulton st, three doors from the Sun Office. Designs, DRAWINGS of all kinds for PATENTS, &c., also made, as above, at very low charges. * * * * * COPPER SMITH!--The subscriber takes this method of informing the public that he is manufacturing Copper Work of every description. Particular attention is given to making and repairing LOCOMOTIVE tubes. Those at a distance, can have any kind of work made to drawings, and may ascertain costs, &c., by addressing L. R. Bailey cor. of West and Franklin sts., N. Y. N. B.--Work shipped to any part of the country. 45to2dv18* * * * * * BLACK LEAD POTS!--The subscriber offers for sale, in lots to suit purchasers, a superior article of BLACK LEAD POTS, that can be used without annealing. The price is low, and founders are requested to make a trial. SAMUEL C. HILLS, 45to2ndv6 Patent Agent, 12 Platt street. * * * * * ELECTRICITY. SMITH'S CELEBRATED TORPEDO, OR VIBRATING ELECTRO MAGNETIC MACHINE--This instrument differs from those in ordinary use, by having a third connection with the battery, rendering them much more powerful and beneficial. As a CURIOUS ELECTRICAL MACHINE, they should be in the possession of every one, while their wonderful efficacy as a medical agent, renders them invaluable. They are used with extraordinary success, for the following maladies. RHEUMATISM--Palsy, curvature of the Spine, Chronic Diseases, Tic-doloureaux, Paralysis, Tubercula of the brain, heart, liver, spleen, kidneys, sick-headache. TOOTHACHE--St Vitus dance, Epilepsy, Fevers, diseases of the eye, nose, antrum, throat, muscles, cholera, all diseases of the skin, face, &c. DEAFNESS--Loss of voice, Bronchitis, Hooping cough.