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Image from page 245 of "American engineer and railroad journal" (1893) | by Internet Archive Book Images
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Image from page 245 of "American engineer and railroad journal" (1893)

Identifier: americanengineer67newy

Title: American engineer and railroad journal

Year: 1893 (1890s)

Authors:

Subjects: Railroad engineering Engineering Railroads Railroad cars

Publisher: New York : M.N. Forney

Contributing Library: Carnegie Library of Pittsburgh

Digitizing Sponsor: Lyrasis Members and Sloan Foundation

 

 

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levations give a clear idea of the con-struction of the head and cylinder. The tie rods are 23 in. indiameter, and the two ])umpshave plungers of ditrerentdiameters, so that the speed c;ui be varied tosnit the work in hand.It is possible, how«ver, to run both junnps at a [iressure of40 tons, so that for the ordinary work of pressing on ear w lieelsthe full speed can be iitili/.ed. It is a big storv to tell, but thispress has put 52 pairs of wheels on their axles in 65 minutes.It will be seen, from the engraving of the vertical s<Ction ofthe pump, that the plunger is arranged so th.at it is double-act-ing, and there is a continuous flow of liquid from the pump tothe ram from both pumps. The substantial construction ofthe machine and the record that it has made certainly is suffi-cient evidence of its value. We will continue the illustration of these special tools in ournext issue. METHODS OF TIN MINING IN THE MALAYPENINSULA. In a recent report, the United States Consul at Singapore

 

Text Appearing After Image:

UVUR.\ULIC PRESS, DELAWARE A IIIDSON C.\N.\L COMPANY. gives an interesting account of the methods of mining pursuedby the Malays and Chinese in the extraction of tin from thetin deposits of the Malay Peninsula. It apjiears from the re-port that more than one-half the worlds tin is mined in theStraits Settlements, the output for the year 1891 being 57,551tons, against 36,061 tons for the Straits Settlements. If to this36,001 be added tlie 12,106 tons, t)ie ouli)utof the Netherlands,India, whose tin-bearing islands are within a few hours steamof Singapore, it leaves but 9,384 tons for the rest of the world. Up to tlie introduction of modern tin mining and smeltingmachinery, in 1889, the tin was worked for a century in a mostprimitive fashion liy the JIalays. They simply dug down atthe base of a hill, took up the clay which contained the bijitimah (small nodules), and carefully washed it in runningwater. AVlien dry it was melted in a furnace built of clay be-tween two liiyers of charcoal

 

 

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