In the columns of the Scientific American we shall endeavor to give those details that will, we trust, interest our readers and promote the cause of American improvements. =BATHS.= After leaving the bridge, the passage way to the interior of the Castle is ornamented on both sides with a pleasing display of Baths--the immersion bath made of tin and of iron, and these combined with the showering apparatus. The shower baths are variously constructed, and some of them are of finished workmanship and costly material. Stebbin's Patent Furniture shower Bath presents itself first in the form of a very convenient washstand, with all its out fit; it is next easily converted into a work stand; with equal dispatch it assumes the form of a shower bath, furnished with every requisite. We regard this as an ingenious piece of furniture, that will greatly increase the use of the shower-bath, and thus add to the health of the community. =SOFA BEDSTEADS.= Much ingenuity has been expended in combining the Sofa and Bedstead. The first that attracted our attention was that manufactured by Mr. John A. Robson, 30th st. and 8th Avenue. It is on the double cone spring, so constructed that using it as a bed does not affect the cushion, and vice versa. The matrass or bed is 4 by 6 feet, without an intervening bar. It is exceedingly simple, of admirable contrivance, and of moderate price. =CUTLERY.= The display of American Cutlery is rich, affording a most gratifying evidence of the progress of the useful arts among us. Our neighbors, J. C. Nixon & Sons, in the Sun Buildings, feel quite confident that they will, as usual, carry off the premiums, particularly for their much celebrated tailor's shears. In the manufacture of engravers' tools; they challenge not only all America, but the world itself.--They manufacture for customers, from whom their articles have derived their just and solid reputation. (_To be Continued._) =Improved Steam Printing Press.= We have recently seen a model of a new Steam Printing Press, the invention of Mr. Wm. W. Marston, a young and ingenious mechanic of this city. A mass of other matters prevents our giving a description at present; we shall probably procure an engraving, however, and publish a full description in a few days. =Information to persons having business to transact at the Patent Office.= OF MODELS. (_Continued from No. 2._) SEC. 26. The law requires that the inventor shall deliver a model of his invention or improvement when the same admits of a model. The model should he neatly made, and as small as a distinct representation of the machine or improvement, and its characteristic properties, will admit; the name of the inventor should be printed or engraved upon, or fixed to it, in a durable manner. Models forwarded without a name, cannot be entered on record, and therefore liable to be lost or mislaid.