This is an article long wanted in a number of situations where power is applied by stiff gearing, such for example, as where one or more run of stones are driven by spur or bevel gearing. The coupling is secured to connect the ends of the principal driving shafts as in the style of an ordinary coupling, or in case of back-lash in the mill spindles it is placed immediately above the gear in such a manner as to allow it to be easily moved up out of gear, at the same time producing an elastic movement in the transmission of power. It gives the advantage of a belt connection in a great measure, in allaying the jar produced by fast running gear. It is constructed of cast iron in two parts, with a space or opening between to receive the requisite number of large stiff rubber springs; each half is secured independently to the ends of the two shafts needed to be coupled, and the power is transmitted by pressure upon the springs; a like connection is made with the gear or trundle-head and mill-spindle of a mill stone. They are furnished of different sizes to suit the situation and amount of power to be conveyed. GEARING. [Illustration: Bevel Core Wheel.] This is a clear representation of the style of our bevel core gear patterns. It was engraved from a photograph taken direct from the casting to show correctly the proportion, shape, &c. With this style of gear, as well as those for spur gearing, we are sufficiently supplied to meet most any reasonable demand. All our patterns were made for the purposes of flouring mills, with a view to avoid superfluous metal, at the same time, to make them strong and in good proportion. Our spur bolting gear patterns have been prepared with special care; the patterns being iron with the teeth cut from blank rims by a gear cutter, they remain true and from these always make true castings. The arms are curved and oval in shape, and the whole of a design exactly meeting the tastes of the most skillful mill-wrights. Any odd wheels that may be needed to complete the outfit of a job, we have arranged to get on short notice. There being some half a dozen foundries within a few blocks of our works, it will be seen we do not lack the means near at hand. Having a gear cutting machine in our establishment, we are prepared to face and dress the cogs of spur pinions, trundle-heads, and spur gear of 40 inches diameter and less of narrow face, and those of 24 inches diameter and less of most any face or pitch. Wood Cogs.