oleine is old and well known that we can as sure all our readers. It is probable that the 1848 but it is too complicated to be explained without drawings. It has before been alluded to in the Sci. Am. to some time since and the books forwarded. Your engraving and advertisement will appear next week. We could not find room for it in this number. ' W. C. C. of Ala.'—J. E. Gower & Co. manufacturers of the Submarine Armour re side in Boston Mass. 62 Broad st. 'Correspondent'—Is informed that we do not know of any such establishment as he re fers to. 'C. 0. R. of California.'—Glad to hear from you
oleine is old and well known that we can as sure all our readers. It is probable that the 1848 but it is too complicated to be explained without drawings. It has before been alluded to in the Sci. Am. to some time since and the books forwarded. Your engraving and advertisement will appear next week. We could not find room for it in this number. ' W. C. C. of Ala.'—J. E. Gower & Co. manufacturers of the Submarine Armour re side in Boston Mass. 62 Broad st. 'Correspondent'—Is informed that we do not know of any such establishment as he re fers to. 'C. 0. R. of California.'—Glad to hear from you. The buisness referred to is progress ing finely we shall be able to communicate with you by the last steamer in May. 'H. & D. of N. Y.'—We have given all your purpose well but do not advise a change if with your present mode you are doing a profitable buisness. ' W. McB. of Ohio.'--We cannot discover anything patentable in the sketch sent. It is a cutter wheel with adjustable cutters—a good machine but not new. ' N. B. of Mo.'—The specifications and drawings of your invention with fees were An engraving of the 'Clutch ' will appear in next week's Sci. Am. It is a good inven tion. demanded immediate attention. Have you not received it ? Money received on account of Patent Office C. S. & M. of Pa. $50 ; W. S. K. of Vt. $20; D. N. T. of Vt. $40 and H. T. Back Volumes Scientific American. Notice AD Terms of Advertizing. A LIST OF VALUABLE SCIENTIFIC AND MECHANICAL BOOKS Iron Ware and Varnish Makers Patent Office. TO CORRESPONDENTS. ' A. W. De C. of Me.'—We have received both model and letter. The Caveat fee is $20 paid down. Your plan appears to be a very without a patent. You may make any bar gain you choose. 'J. G. of N. H.'—We cannot tell how the valves of the English engine areo perated whe ther by heart cams or others but on page 313 Vol. 2 Sci. Am. there is an engraving of one. Mr. Bishop's. There is no man who wishes to save money who should be without
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