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It has been superseded in our day, by improved piston guides and cross-heads, the construction of which in Watt's day was impossible, but no invention has commanded in greater degree the admiration of all who comprehend the principles upon which it acts, or who have witnessed the smoothness, orderly power and "sweet simplicity" of its movements.
Sullivan spread his legs wide, took both of Larry's wrists in one hand, and swung the unconscious man across his back. He strode to the iron stairs and began to climb. As he reached the first grating Larry groaned. Dan stopped dead; near him the great cross-heads were plunging steadily up and down. "God, Mr. Neville, did he hit ag'in' somethin'?" The sweat of strain and fear covered his face.
As may be imagined, the London papers that afternoon were full of the mystery. Nothing like a first-class "sensation," sub-editors will tell you. There is art in alliterative headlines and startling "cross-heads." The inevitable interview with "a member of the family" who is generally anonymous, be it said is sure to be eagerly devoured by the public.
We're going to put in a new cage, next month," he added casually, as they drew near the shaft. "What's that for?" asked Charlie, to whom cages and their construction were a mystery. "Safer, and can carry more," answered his host concisely. "These cross-heads and buckets are slow work.
His first engine had two vertical cylinders of eight inches diameter and two-feet stroke, working by cross-heads; the power was given off by spur-wheels; it had no springs, consequently it jolted very much on the then bad railways; the wheels were all smooth, as Stephenson was sure the adhesion would be sufficient.
The ram raises the cross-head 6 feet at each stroke, and with it the tube, when that height is attained, a lower set of chains on the beams grip the next set of links, and thus prevent them from slipping down, whilst the clamps on the cross-heads are unscrewed, the upper links taken off, and the ram and cross-head lowered to take another stroke."
The shop man may not have properly set up the nuts on the valve-stems; or may have fitted the distance bushings between the shield plates too closely; the superheat of the steam may distort the steam chest slightly and produce friction that will interfere with the regulation. If any of the valve-stems should become loose in the cross-heads they may screw themselves either in or out.
A man from Odessa dismissed them both as 'cross-heads. It was impossible to unite such mutually superior elements. Again weary and heart-sick, he returned towards the inn. But his way was blocked by a turbulent stream of Jewish boys pouring out of the primary school.
Grant," said Furneaux, "you might just show me exactly where you were standing when you saw the face at the window." "For the love of Mike, what's this?" gurgled Hart. "'The face at the window'; 'the postmaster's daughter. How many more catchy cross-heads will you bring into the story?"
The heavy thud of the cross-heads, flashing between their guides, beat time to the clang of the valve-gear, a pump throbbed like a kettledrum, and something tinkled like a high-pitched triangle. All went well, the engines were good and Terrier stubbornly forged ahead. By and by the strain was less marked. The load was getting lighter and after a time Lister let go the wheel and wiped his wet face.
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