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The American artist heard with a vague smile the difference between the ordinary four-cycle engine of an automobile, and the two-cycle engine of this marine motor, with its piston receiving an impulse at each down stroke; tried to understand how the charge of vaporized petrol was drawn into the crank-chamber, and there slightly compressed; how the gas afterwards traveled along a by-pass into the firing chamber at the upper part of the cylinder, to be further compressed by the up-stroke of the piston and fired by the sparking plug, while the burnt gases escaped through a port uncovered by the piston in its downward strokes, admission and exhaust being thus controlled by the piston movement alone.
I wish the Judge and Jury to notice two things in this signature the cleanly-cut edges of the letters, and the two lines of indentation produced by the two prongs of the pen, in its down-stroke. They will also notice that, in the up-stroke of the pen, there is no evidence of indentation whatever.
In this engine a free piston was used in a vertical cylinder, the former being thrown up by the force of the explosion. The only work done on the up-stroke was that to overcome the weight of the piston and piston rod, and the latter being made in the form of a rack, engaged with a toothed wheel on the axle as the piston descended, causing the fly-wheel and pulley to rotate.
The exhaust valve remained open as usual during the succeeding up-stroke of the piston, and the valve was held open until the piston had returned through about one-third of its downward stroke, thus permitting fresh air to enter the cylinder.
But in the latter case, the wind slides out over the edges again, so that there is no trouble in holding on to the umbrella. The peculiar shape of the wing is only one of the ways by which the down-stroke is made to strike the air with more force than the up-stroke.
As the old man inspects, through his glasses, every up-stroke and down-stroke of both documents before he releases them from their leathern prison, and as he counts the money three times over and requires Judy to say every word she utters at least twice, and is as tremulously slow of speech and action as it is possible to be, this business is a long time in progress.
Pickwick, wholly unable to repress a smile. 'Yes, I think it is, resumed Mr. Magnus. 'There's a good name before it, too, you will observe. Permit me, sir if you hold the card a little slanting, this way, you catch the light upon the up-stroke. There Peter Magnus sounds well, I think, sir. 'Very, said Mr. Pickwick. 'Curious circumstance about those initials, sir, said Mr. Magnus.
"Then, I have the pupil place his bow in the middle, in position to draw a down-stroke from the wrist, the bow-hair being pressed and held against the string. A quick down-bow follows with an immediate release of the string. Repeating the process, use the up-stroke. The finished product is merely the combination of these two exercises drawing and attacking simultaneously.
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