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Updated: May 20, 2025
Mr Dugald Clerk's original two-stroke cycle engine is indicated roughly, as regards principle, by the accompanying diagram, from which it will be seen that the elimination of the ordinary inlet and exhaust valves of the four-stroke type is more than compensated by a separate cylinder which, having a piston worked from the connecting-rod of the power cylinder, was used to charging, drawing the mixture from the carburettor past the valve in the top of the charging cylinder, and then forcing it through the connecting pipe into the power cylinder.
The second engineer more reckless than resourceful struck at random with a cold chisel into the cast-iron of the column, and a greasy, grey flake of metal flew from under the imprisoned foot of the connecting-rod, while the rod itself fell away slowly, and brought up with a thunderous clang somewhere in the dark of the crank-pit.
Still other springs press the straps against the surface upon which the carbon bears, cutting off leaks through joints and across horizontal surfaces of the carbon. The whole ring is prevented from turning by a connecting-rod which engages a pin in the hole, like those provided for the springs. The Safety-stop This consists of a flat ring placed around the shaft between the turbine and generator.
Near Watford we lost half an hour by the breaking of a connecting-rod: but the London and North-Western is a model railway, and we ran alongside the pier at Holyhead exactly "on time."
A part of the machinery is always above this deck; where the connecting-rod, in a strong and lofty frame, is seen working away like an iron top- sawyer. There is seldom any mast or tackle: nothing aloft but two tall black chimneys. Directly you have left the wharf, all the life, and stir, and bustle of a packet cease.
G. Mareschal has invented and had constructed an ingenious system that we shall now describe. Mr. The axis, M, of the jack, on revolving, carries along a crank, MD, to which is fixed a connecting-rod, A, whose other extremity is attached to the horizontal beam that supports the zincs and counterpoises.
Overhead the dark and bulky cylinders cut against the reflected glimmer on the skylights; below, valve-gear and connecting-rod flashed across the gloom, and the twinkling cranks spun in their shallow pit. One saw the big columns shake and strain as the crosshead shot up and down; the thrust-blocks groaned with the back push of the propeller.
Look at those eccentrics and that connecting-rod! I expect to see something go any minute; and then there's no use saying what will come next. He sat down on his bench and covered his face with his hands. "It seems, the 'Spezzia' question was decided about that time on deck, and the 'Ercolano's' bow suffered to fall off in the direction of that bay.
All was red with rust, and the shaft of the connecting-rod in particular seemed so frail, that at one moment I was very dubious: I decided, however, and, except for a slight leakage at the tubulure which led the steam to the valve-chest, all went very well; at a pressure never exceeding three-and-a-half atmospheres, we travelled nearly a hundred and twenty miles before being stopped by a head-to-head block on the line, when we had to abandon our engine; we then continued another seven miles a-foot, I all the time mourning my motor, which I had had to leave at Imbros, and hoping at every townlet to find a whole one, but in vain.
He will like mathematics for its own sake, and when, later, in college, and later still, in the active pursuit of his chosen work, he is confronted with a difficult problem covering strains or stress in a beam or lever or connecting-rod, he will attack it eagerly, instead of as I have seen such problems attacked more than once irritably and with marked mental effort.
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