The annexed engravings are views of an improved gague for steam engines, invented by J. L. Eastman, of East Boston, Mass,, who has taken measures to secure a patetit for the same. Figure 1 is an outside front view; figure 2 is a view of the interior of the gague; figure 3 is a front view of the button and elastic cushion seat; figure 4 is a section of the lower part of figure 2. The same letters refer to like parts. The front view merely shows the dial plate with the index around it, marked from 0 to 130 ; and the pointer or hand, according to the number at which it points gives indication of the pressure oi steam in the boiler to which the instrument is attached. The gauge consists of a small iron box like the one represented, and may be placed either close to or at a distance from the boiler, such as the counting house in a factory or foundry, or in the captain's office of a steamboat. A is a coiled spring firmly secured at one end by a nut to a bar fastened to the case. It is secured at the other end to the working lever, D ; ? is a small rack attached to this lever ; it gears into a small pinion (not seen) the axis of which is also the axis of the pointer or hand of the dial plate. The action of lever D, sideways, moyes the rack, B, and the pinion mentioned, and consequently the pointer on the dial. This lever, therefore, is actuated by the steam and moves the rack to the righb farther from the pinion spindle according as the pressure of the steara increases, and vice versa. ? is a small close steam chamber into which the steam pipe at ? {as shown in figs. 2 and 3) from the boiler enters; ? is a metal block or button firmly secured by a screw bolt, I, to iorm a seat to the small steam box, K, and a fulcium for the spring lever, D, at E, wheer the foot oi the lever is made sharp and is held in a notch made in the lower part of the said button ; F is a stem on the lever, D ; J is an aperture in the button, and G is a cushion of prepared india rubber, attached to the stem, F, covering the aperture at cavity, L, between the passage, M, and the aperture, J, in the button. This idia rubber cushion, G, is secured between the end of the chamber, K, and the inside oi the button, H. The steam, therefore, pressing upon this elastic cushion, will actuate the lever, D, through the stem, F, according to its pressure, and thus operate the rack, B, and consequently the index hand on the dial plate. This guage in construction and operation is simple and durable, and will be easily understood from the engravings and the description given. Such gauges are made with dials ranging fordifferent pressures as required, such as one kind for 40 lbs. pressure, another lor 100 lbs., another for 130, and another for 200 lbs. This is a spring gauge, the operation of which is not due to an expansion of metal, but simply the pressure of the steam acting upon an elastic medium through which it operates the indicating lever. It is this much different from the Salter Balance, that the lever is not operated by a movable valve, which oftentimes becomes so fixed in its seat that no dependance can be placed upon it.— The elastic cushion having the butt of the stem, F, of lever, D, bearing upon it, is acted upon by the pressure of the steam through the passage, M, in precisely in the same manner as the leather bag " at the bottom of the portable barometer" is acted upon by the pressure of the atmosphere on the mercury. These gauges are sold by the inventor in Orleans street, East Boston, Norris Gregg, & Norris, Gold street, this city, (?. ?.) and Scaife, Atkinson, & Okely, Pittsburgh, Pa. We are not' able to give_ the prices of such gauges, but further information may be obtained by letter addressed to Mr. Eastman.