J. L.,ofN.Y.— If you imagin8 that the machill yon describe will operate of itself, you would ue convinced of your error upon making a trial. We Imve no confidence whatever in such a jumbled-up mCBS of whceIs, rollers, gudgeons, inclined l)lanes, weights, c. We mean to do you a service when we say that your time is completely wasted npon such moonshine projects. F. D., of N. Y.—The tarnishing of silver goods generally arises from the presence of a small quantity of sulphurous gas in the atmosphere. D. M. n., of Tenn.—It is decidedly dangeroHs tu lise chalybeate wnter in a boiler. The purer tho water is in a boiler, the better. You should read our articles on the subject of boilers ill the two last and next numbers. T. T. E., of Oregon.—You had bf't tcr purchase Dr. Reid on the Ventilation of American Dwellings," publisbed by Wiley Hal.tead, 351 Broadway, New York. J. S. H., of Cal.—Carbonic acid has long been known to 11088es8 antiseptic properties, bnt it is not so strong or so convenient of application as pure carbon, or charcoal, which is the bcst anthlcptic known. J. L. D. D.—It is not new to form journals hollow, with small openings in the portions of their pcriphcries which bear on the boxeR, for the lubricating oil or water to percolate through. H. P., of Mo.—YOUl' ideas of the advantages of low roofed rooms are incorrect; a Hltting-roolll cannot be too high. A. B., of Mo.—The method of making and filling balloons, and a full history of serial navigation, is given in Wise's " History and Practice of MronanticB," published by J. A. Specl, Philadelphia, in 1850. B. S., of Md.—Wo have received your communication on the Atlantic telegraph cable, and in view of the early arrival of intelligence of the result of the last effort to lay it, we have concluded to postpone the consideration of your views until after that period. J. II. G., of Ky._Your arrangement of cog wheels is well-known, and is called step gcaring. It is in usc on some of the ocean steamships for driving screw prorcllers. J. B., of Flu.—Mucilaginous sulwlaucea, like slippery elm or potatoes, have been snecessfully used for remov--jjjg^cale from 3tram boilers. The material which we believe i*snerally considered best for covcrlllg Bteam pipes to prevcnThftpndensation, is felt, but either of the materials yon propel we should think would serve very wclL We hare n-knowledge which enables us to say wdwhichl.\Vo would bs theTfesk It is decidedly udn..able to pl'ovide a cock for the escapisof wat er ot condensation from the pipe. A common ffa'ce .pnmp wouhl serve the purpose of feeding the boiler. L., of Cal.—We arc not awarc of any new deodorizing agent which has lately achieved great success, and w; think that common chloride of lime, 01', a3 it is called, Hblcaching powder," is the best. Make a saturated solution and bottle it, and you will find that it will sey well. You had better communicate with Mr. Benson, of Front street, Brooklyn, concerning a vacuum pau, telling him the work you wan'; to do. I. H. C., of Ohio. —We do not discover anything new in your filter. Small filters to be attached to hytlrants hdve been so constructed that in filtering the water passed upward through the diaphragm, and provision was made by a two-way cock, to cause the water to pass upwards to be filtered, or downwards to wash away the dirt. Wright'8 patented filter is on this principle. C. C., of Mich.—Yon have done wisely by submitting your invention for ex:nnination before exposing its peculiarities to the inspection of the curious. Z. H. C., of Ohio__The " curiosities" yon scnd for our examination are simply quartz stones. They are about equal in value to some pearls, which, it is said, were obtained in a 8mall brook in Massachusetts after a week's labors. The best of them were valued at a cent apiece. G. C, of Mass.—Henry 'Vadsworth did not obtain a putent in 1850 for un adhesive plaster. It. is not the subject of a patent; therefore, you can go on and make a plaster for wounds of isinglass or any other substa.nce. J. J. H., of Ala., and G. C., of Ga.—Procure one of Wheeler Wilson'8 smYing machines. Yon cannot do better. A. T. B., of Ohio.—Pitts' patent on sepHrators expired on the 29th of last month. The patentee memorialized Congress for another extension, but the Committee on Patents made an adverse report. The invention is now public property. Money receh"ed at the Scientific American Office on account of Pateut Office business, for the week ending Saturday, July 3,1858 :— H. C. S., of Ohio, $30 : S. E. R, of-----, $33: M. M., of L. I., $30 : C. L. S., ofKy., $25:. J. J., ofN. Y., $30: E. R., of Wis., $25: I. D., of Conn., $30: J. M., of N. Y., $30 : R. P. E., of Pa., $30: J. R. F., of Ohio, $30 : J. M. E., of N. Y., $30: C. S., of L. I., $30 : J. C. C., of N. Y., $30: M. B. II.,of-----,$30: J. M., of Iowa, $50: J. H., of Ind., $35 : H. C. F., of PR., $55 : G. II., of Conn., $25: J. D. S., of Ohio, $25 : S. H., of N. II., $30 : I. P. II., of Ill., $30 : G. W. S., of Conn., $35: C. P. S., of Cal., $25: A. E. MeG., of Minn., $20: E. G. G., ofN. Y., $30: L. G., of Conn., $250: R. E., of N. Y., $25 : H. H., of N. Y., $30 : A. W., of N. Y., $30: S. B. S., of Mo., $25 : E..G. A., of Conn., $3*; F. D. L., of S. C., $250. Specifications and drs wings belonging to parties with the following initials h3ve been forwarded to the Patent Office during the week ending Saturday, July 3, 1858:— S. N. L., ofN. Y.: C. L. S., ofKy. : A. S., ofN. Y.: J S. B. S., of Mo.: G. H., of Wis. : R. R, of N. Y.: J. ) M. K, of N. Y.: G. W. S., of Conn.: C. P. S., of Cal.: R. , of Wis. ; J. D. S., of Ohio. Literary Notices LORD MONTAGU'S PAGE, EyG. P. R. James. Childs Peterson, Philadelphia.—This is a new historical romance from the pen of this most prolific of modern authors, and will no doubt be bailed with pleasure by thousands of readers who devour each new work aa it comes from Mr. James' pen. The present romance seems rather whimsical in its character ; but the incidents must be exciting, the personages graphically Ill'awn, and the unities of the story well preserved, as all will bear the impress of the master's hand. BLACINVOON'S MAGAZINE.—The above magazine for this month in a most entertaining number. Messrs. Scett Co., No. 54 Gold street, tliis city, are the publishers of the four British Quarterlies, namely: the Edinburgh, Westminster! I,ondon and North British Reviews, as well as the above magazine, and to their credit it shonld be related, they voluntariiy pay over $3.000 per annum to the foreign publishers. New volnmes of these able periodicals commence this montll (July), thus affording a good opportunity for new subscribers to begin and old subscribers to renew their fmbscrfptiollS. Those Who desire to be well versed in foreign litcrature should read these pnblications.
This article was originally published with the title "Correspondents"