By William Charles Copperthwaite
On the time of writing, almost not anything were released at the historical past of shield-work - the employment of a protect, without or with assistance from compressed air, in tunnelling operations of English beginning. The author's goal used to be to collect in a single quantity a mass of knowledge till then scattered and hard to find.
summary: on the time of writing, almost not anything were released at the heritage of shield-work - the employment of a protect, without or with the help of compressed air, in tunnelling operations of English beginning. The author's objective used to be to assemble in a single quantity a mass of data until eventually then scattered and hard to discover
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Additional info for Tunnel shields and the use of compressed air in subaqueous works
3 Proc. Inst. , vol. x. pp. 3 5 6 - 3 6 6 - 3 6 7 . 2 29 TUNNEL SHIELDS The manner of sinking a shaft by Pott's method consisted in attaching to the top of the cylinder to be sunk by an airtight joint, a box or lock which for some reason was known as the " doctor," provided with two doors, the one communicating with the shaft the other with the open air. When the doors were closed an exhaust pump outside the " doctor " was set to work, and the air in the " doctor " exhausted as far as possible.
The more serious illness which is produced by compressed air work carried on under certain conditions, is known as caisson disease, and has of late years been the subject of careful study by competent observers (see footnote on page 22). Though the pathology of the disease can hardly be said to be perfectly under stood, the observations made of it have enabled engineers and contractors engaged in this class of work to draw up certain general regulations for the control of their men, and the supervision of their health, which have given beneficial results.
Barlow considered the Greathead shield as constructed an advance on his own, or else, as is probable was the case, that the whole direction and management of the new system of tunnelling was in the hands of Mr. Greathead. The exact apportionment of the credit of the invention between these two men will be decided by each reader according as he may consider the original inventor of a new mechanism, or the man who applies it to practical use, the more deserving of credit. It has been said above that the idea of the modern shield was first published by Barlow in 1864, and that the first shields actually used in tunnel work were employed practically simultaneously by Greathead in England and Beach in New York in 1869, and so far it is an arguable point to whom credit should be ascribed for initiating a new departure in tunnel work.