Chemical News and Journal of Industrial Science, Tom 145,Wydanie 3770Chemical news office., 1932 |
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Strona 22
... boring operations of a primitive kind were undertaken in many parts of the world- in search for water , salt , or other minerals --but it was not until the beginning of the twentieth century that any rapid develop- ment in boring ...
... boring operations of a primitive kind were undertaken in many parts of the world- in search for water , salt , or other minerals --but it was not until the beginning of the twentieth century that any rapid develop- ment in boring ...
Strona 24
... boring . The rotary method of drilling operates by means of abrasion . A drill pipe , made up of lengths screwed one to another , connects a drilling bit to revolving apparatus on the surface . The weight of the pipe bears on the bit ...
... boring . The rotary method of drilling operates by means of abrasion . A drill pipe , made up of lengths screwed one to another , connects a drilling bit to revolving apparatus on the surface . The weight of the pipe bears on the bit ...
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activity adopted applied boring Buildings calculated carbon Communicated compared completed conduction considerably Controller convection cool countries define depth described determination direct discovery distribution drilling effect elastic emitted existence experience experimental explosion fact factor field flame flowing fuel furnace further gases given heat transfer important increased industry instance Institute for Medical interest issued June knowledge known laboratories late limited London lower Marks mass measured Medical Research medium ment method National Institute nature nights obtained Office operates original Patent path petroleum possible practical present pressure principles processes production proportion published quantities radiation recently recommended recorded reduced regions Research reservoir rock scientific shape simple solids square standard preparation station steam structural studied suitable surface temperature tion underground unit values vapour various vitamin waves workers