The annexed engravings are two views of an improvement in vises, whereby the ordinary is converted into a taper vise by an adjustable attachment to be applied for that purpose. The improvement is exceedingly simple, and requires but few words to explain its construction and use, so as to render its operation clear to any person. Figure 1 is a perspective view of a common vise, with attachment applied to it, and a taper piece of metal to be operated upon between the jaws. Fig. 2 is a perspective view of the attachment. The same letters refer to like parts. A A are the jaws of an ordinary vise (the other parts of it need not be described.) The attachment, fig. 2, is screwed to one of the jaws, A. by the clamp, C. This attachment has a taper jaw, B, secured on a vertical axis, D, and when it is screwed to one jaw of the vise, as shown in fig. 1, it can be turned so as to embrace a taper piece of metal, like W, to be filed or otherwise operated on, which could not be done in a common vise with parallel jaws, as the piece, B, has its apex placed close to the inside of jaw A, so as to alter the taper of the jaws to suit the taper of the article to be embraced between them. This improvement was patented on the 30th of last November; the inventor is J. W. Bliss : the manufacturers are Roys & Wilcox, of East Berlin, Conn., to whom all letters about it should be addressed. These gentlemen manufacture all sizes, from the small jeweller'sj up to the largest si"e of machinist's vise. The claim of the patent for this improvement will be found by our readers on page 102, this volume of the " Scientific American.”