File:Transactions (1852) (14579287689).jpg

Identifier: transactions53nort (find matches)
Title: Transactions
Year: 1852 (1850s)
Authors: North of England Institute of Mining and Mechanical Engineers, Newcastle-upon-Tyne North of England Institute of Mining and Mechanical Engineers, Newcastle-upon-Tyne. Report of the Committee upon mechanical coalcutting, 1905
Subjects: Mineral industries Mechanical engineering
Publisher: Newcastle-upon-Tyne
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
four wheels on the ordinarypit-way and is fixed either with the rails flat on the floor inwhich case the front wheels are dropped off the end of therails; or the carriage spragged up so as to prevent its rebound-ing ; or the carriage may be inclined towards the face byraising the rails about 12 inches at the back end. In the * British patent, 1904, No. 24,303. REPORT OF COMMITTEE UPON MECHANICAL COAL-CUTTING 59 first case, the machine mustbe fed up to theface, as the pickworks its way inby means of ahandle, at theback end of thecarriage, turn-ing an endlessscrew passingthrough the body of thepedestal carry-ing the machine.This arrange-ment entailsmore work forthe attendantand, probably, aman would berequired insteadof a boy. Thelatter method ofraising the railsis, thereforepreferable, bywhich the ma-chine feeds it-self forward asthe cut deepens,the attendant isonly required tomove the ma-chine round onits centre, andwhen it comesagainst the coal,he puts a longerdrill on the ma-chine.
Text Appearing After Image:
< Q o p O pq 60 REPORT OF COMMITTEE UPON MECHANICAL COAL-CUTTING. In place of a man paid 7s. 3d. a shift with, the machine onwheels, a lad at 3s. 3d. is sufficient to attend to it on the framecarriage, when the back end is raised. Two types of carriage have been used, one being fitted withan elevating screw, by means of which the machine can be raisedor lowered to suit the height of the band to be cut; and theother, without a screw, is used for cutting in the bottom coal. The section of seam is as follows: —Coal, 1 foot 2 inches;stone, 4 inches; coal, 4 feet 6 inches, making a total thicknessof 6 feet. The holing, begun in the 4 inches of stone, is sloped upwardsinto the overlying coal. With a big lad in charge of the machine, a heading 10 feetwide, has been cut to a depth of 3 feet 11 inches in 30 minutes;and seven places, 10 feet wide, have been holed to a depth of3 feet 6 inches in 6 hours with a man in charge; these beingrecord performances. The air-pressure is 50 pounds per

Note About Images