The Proportions and Movement of Slide ValvesTechnical Publishing Company, Limited, 1903 - 160 σελίδες |
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Σελίδα iii
... , which has enabled him to collect and reprint the articles in what he hopes will prove a con- venient and acceptable form for reference . Lincoln , March , 1903 . CONTENTS : INTRODUCTION CHAPTER I. Cases 1-13 PAGES 1-7 :
... , which has enabled him to collect and reprint the articles in what he hopes will prove a con- venient and acceptable form for reference . Lincoln , March , 1903 . CONTENTS : INTRODUCTION CHAPTER I. Cases 1-13 PAGES 1-7 :
Σελίδα 4
... reference is sufficient to prove that lap was in use for stationary or marine engines , if not for locomotives , in ... references to the now familiar contrivance known as automatic expansion gear . This is clearly indicated by the words ...
... reference is sufficient to prove that lap was in use for stationary or marine engines , if not for locomotives , in ... references to the now familiar contrivance known as automatic expansion gear . This is clearly indicated by the words ...
Σελίδα 6
... reference to this real position of the crank at A , the angle of the eccentric with the crank being invariably denoted by the letters A O C. But for all other purposes of reference the crank is to be supposed to start from the point B ...
... reference to this real position of the crank at A , the angle of the eccentric with the crank being invariably denoted by the letters A O C. But for all other purposes of reference the crank is to be supposed to start from the point B ...
Σελίδα 17
... reference to the real position of the crank at A. Thus with the eccentric at O C1 , the valve would close when the crank ( assumed to be starting from B ) reached D1 , and so on . The several travel circles corresponding to the radii O ...
... reference to the real position of the crank at A. Thus with the eccentric at O C1 , the valve would close when the crank ( assumed to be starting from B ) reached D1 , and so on . The several travel circles corresponding to the radii O ...
Σελίδα 18
... radius O D , will cut the lead line C Q at C , and O C will represent the throw and angular position of the eccentric with reference to the position of the real crank at A , the 18 THE PROPORTIONS AND MOVEMENT OF SLIDE VALVES.
... radius O D , will cut the lead line C Q at C , and O C will represent the throw and angular position of the eccentric with reference to the position of the real crank at A , the 18 THE PROPORTIONS AND MOVEMENT OF SLIDE VALVES.
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The Proportions and Movement of Slide Valves William Dyson Wansbrough Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
The Proportions and Movement of Slide Valves William Dyson Wansbrough Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
amount angle A O C angle with respect angular position assumed starting point bar length base line A B closes the port crank occupies crank position crank radius crank reaches cylinder face denoted describe the main Diagram 38 Diagram 45 draw the director exhaust lap expansion circle expansion eccentric expansion plate fulfil the given given conditions inner slot line g g main eccentric main lap circle main valve closes maximum minus lap negative lap outer slot perpendicular piston's stroke point of cut-off port opening radii radius equal radius O C real position reopening represent the position right angles SCALE OF UNITS screw movement second slot semi-circle SERIES D single slot slide valve slot circle slot width slot-opening steam port steamway struck from centre throw and angle UNITS DIAGRAM valve and plate width of slot
Δημοφιλή αποσπάσματα
Σελίδα 5 - Before dismissing the subject of loco-motive engines, it ought to be remarked, that they must always be objectionable on a rail-road for general use, where it is attempted to give them a considerable degree of speed ; for many pass-places there cannot be ; hence, the velocity of the greater part of the carriages on a line of road must be limited by a slow travelling one.
Σελίδα 7 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 3 - ... inch, being produced by fixing the eccentrics a little in advance of the position at right angles to the cranks. It is found necessary to let the steam on to the opposite side of the piston before the end of the stroke, in order to bring it up gradually to a stop, and diminish the violent jerk that is caused by its motion being changed so very rapidly as five times in a second.
Σελίδα 7 - They would exist independently of matter, but their existence is no less positive, though immaterial. A system of geometry proceeds from simple, axiomatic, and incontrovertible principles, to the demonstration of new truths ; and from the combination of truths previously known, new truths are continually evolved, and thus a system of geometrical science is established by a continued process of logical deduction. Some of the elementary truths in geometry are so obvious as to be almost self-evident...
Σελίδα 2 - ... their having so small a heating surface, which was only about two and a half square feet for each foot of water evaporated per hour; the proportion in the present one being five and a half square feet, and in stationary engines as much as eight. " The great perfection of the present locomotives, and their superiority to the old ones, is caused not so much by the application of new inventions to them, as by the combination of many former ones, and the uniting together several plans which, separately,...
Σελίδα 34 - Description of the Patent Locomotive Steam Engine of Messrs. Robert Stephenson and Co., Newcastle-uponTyne," the slide valve used for a locomotive built for Messrs.
Σελίδα 2 - ... piston so quickly with the full pressure, and the regulator has to be only partially opened, so as to throttle the steam and check its passage into the cylinders ; which diminishes its pressure, as it has still to occupy the same space. The negative pressure of the waste steam amounts, for this reason, to 30 or 40 per cent, of the positive pressure of the steam upon the piston when the engine is running very fast, and the power of the engine is diminished nearly one-half.
Σελίδα 4 - ... obtain the maximum power by working expansively. But to obtain the greatest useful effect, the full pressure will require to be continued longer; and to an extent which depends on the quantity of friction of the additional machinery necessary to produce the useful effect. An engine ought to be made so that the communication between the cylinder and boiler could be cut off at any part of the stroke, from the one given in the table to full pressure, at the pleasure of the attendant, or according...
Σελίδα 3 - ... consequence of the lead of the slide, and acts expansively for that portion, saving so much of the steam, but diminishing the total power a little : the extent of this action is, however, very limited, as the piston is less than £ inch from the end of its stroke when the steam is shut off. In stationary and marine condensing engines the steam has usually very little or no lead, but it is shut off at two-thirds or three-quarters of the stroke, giving a great amount of expansive action, and the...
Σελίδα 3 - The waste-port is always covered by the slide, as the travel is less than the width of the bars, so that the steam is always prevented from entering the waste-port from the steam chest. During the reciprocating motion of the slide, each of the steamports is alternately uncovered, and the steam allowed...