Identifier: griffithsguideto00grif (find matches)
Title: Griffiths' Guide to the iron trade of Great Britain ... an elaborate review of the iron (and) coal trades for last year, addresses and names of all ironmasters, with a list of blast furnaces, iron manufactories, and other statistics and information respecting iron and coal ..
Year: 1873 (1870s)
Authors: Griffiths, Samuel, editor of "The London Iron Trade Exchange"
Subjects: Coal trade Iron industry and trade
Publisher: London, Published for the Proprietor
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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constructed steam-engineson what is called the Cornish plan, which have sincebeen in vogue at all our metalliferous mines. The costof these engines, however, is a bar to their adoption.The foundations, house, and other appliances fre-quently costs ten, fifteen, and even twenty thousandpounds, much in this respect depending on the depthof the mine to be drained. These remarks must not betaken as inveicrhinrj; acjainst the Cornish engine. Onthe contrary, we say they do more service with asmaller amount of fuel by far than any of their pre-decessors, but the cost of foundations, the complicatedmachinery, the beam, the massive centre gudgeon, thevalves, the levers, the hand gears, the air-pump andcondenser; in fact, the whole machine, for the sei*viceit renders, cannot be compared with the unique and 214 TAXGTES STE-OI rUMPIXG EXGIXE. scientific apparatus in the engraving annexed, inventedby Mr. A. S. Cameron, of New York. Already 3,500of these encrines are fixed and at work, all made at
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the great Cornwall works of Tangye, Bros., at Sohoand Birmingham. It will be observed by the engraving that there is TAXGYES steam PUMPI^G ENGINE. 215 nothing to be seen moving but the piston rod in itsconstant reciprocations, the steam cyhnder to the rightand tlie pump to the left. The power exerted by thesteam on the piston is expended in the pumps throughthe medium of the piston rod itself, the reversingvalves are operated by the piston, all is closed up,nothing exposed to view, and the speed of the engineis retarded or accelerated ad libitum by the regulationof a simple supply valve. The great advantage of these pumps is the facilitywith which tliey can be laid down ; like the horizontalengine tliey are fixed with very little cost, they rarelyget out of order, the seats of the valves being made ofvulcanized india-rubber or something of this kind. Agentle sounding click is heard, whicli has no ring ofmetal, but ratlier gives the idea that^everything is tightand sound like the air p

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