The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 142
Producer gas , water gas , and other gases derived from coal were developed and used in the 19th and 20th centuries , but their role in commerce and industry became small after World War II when natural gas resources began to be ...
Producer gas , water gas , and other gases derived from coal were developed and used in the 19th and 20th centuries , but their role in commerce and industry became small after World War II when natural gas resources began to be ...
Page 507
Smeaton is credited with being the first to reestablish the use of hydraulic cement , which was the forerunner of natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure ...
Smeaton is credited with being the first to reestablish the use of hydraulic cement , which was the forerunner of natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure ...
Page 618
The earth's sur- face provides the stage for human life , and the useful elements of the natural environment - the natural resources - provide the materials necessary for man to survive . At any given time and place , of course ...
The earth's sur- face provides the stage for human life , and the useful elements of the natural environment - the natural resources - provide the materials necessary for man to survive . At any given time and place , of course ...
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