Proceedings, Volume 8

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Pagina 326 - Section 2. The officers of the Association shall be a president, a first vice-president, a second vice-president, a third vice-president, a...
Pagina 196 - Head, n, is threaded on its lower half to screw into the piston-rod more or less, according to the required height of the atmospheric line on the diagram. Its head is pivoted to the piston-rod link of the pencil mechanism. The Cap, 2, screws into the top of the cylinder and holds the sleeve and all connected parts in place. Its central hole is furnished with a hardened steel bushing which forms a durable and sure guide to the piston-rod.
Pagina 197 - The fulcrum of the mechanism as a whole, the point of attachment to the piston-rod, and the pencil point are always in a straight line. This gives to the pencil point a movement exactly parallel with that of the piston. The movement of the spring throughout its range bears a constant ratio to the force applied and the amount of this movement is multiplied six times at the pencil point.
Pagina 327 - Section 2. At each annual meeting the president shall appoint a committee of five whose duty it shall be to report at the next annual meeting subjects for investigation and discussion, and if the subjects are approved by the Association, the president shall appoint special committees to report on them.
Pagina 197 - The pencil lever, links and pins are all made of hardened steel ; the latter— slightly tapering — are ground and lapped to fit accurately, without perceptible friction or lost motion. Springs. In order to obtain a correct diagram, the movement of the pencil of the indicator must be exactly proportional to the pressure per square inch on the piston of the steam engine at every point of the stroke ; and the velocity of the surface of the drum must bear at every instant a constant ratio to the velocity...
Pagina 200 - ... to screw into the upper socket of the piston. Above the threaded portion is a shoulder having in its under side a circular channel formed to receive the upper edge of the socket when these parts are connected together. When...
Pagina 195 - It is made of a special alloy, exactly suited to the varying temperatures to which it is subjected, and secures to the piston the same freedom of movement with high pressure steam as with low; and as its bottom end is free and out of contact with all other parts, its longitudinal expansion or contraction is unimpeded and no distortion can possibly take place. Between the. parts 4 and 5 is an annular chamber, which serves as a steam jacket; it will always be filled with steam of nearly the same temperature...
Pagina 198 - The Testing of the Spring. The rating or measurement of the springs, both in vacuum and in pressure is determined with great care and accuracy by special apparatus. The vacuum test is made by a powerful vacuum pump to which is connected a mercury column marked in inches. The pressure test is by the direct action of the steam in the cylinder of the indicator and in a mercury column, simultaneously operating with a capacity of three hundred pounds pressure per square inch. Suitable and ingenious electrical...
Pagina 196 - Shallow channels in its outer surface provide a steam packing, and the moisture and oil which they retain act as lubricants, and prevent undue leakage by the piston. The transverse web near its center supports a central socket, which projects both upward and downward; the upper part is threaded inside to receive the lower end of the piston-rod; the upper edge of this socket is formed to fit nicely into a circular channel in the under side of the shoulder of the piston-rod, when they are properly...
Pagina 173 - ... introduction of a tool for screwing it in or out. Openings through the sides of the outer cylinder are provided to allow the steam which leaks by the piston to escape.

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