ScienceJohn Michels (Journalist) 1949 |
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Стр. 155
... standards . The first attempt at a standard thread form was made about a hundred years ago by a British tool- maker named Joseph Whitworth . British industry adopted this standard in 1841 or about then and it became known as the British ...
... standards . The first attempt at a standard thread form was made about a hundred years ago by a British tool- maker named Joseph Whitworth . British industry adopted this standard in 1841 or about then and it became known as the British ...
Стр. 158
... STANDARD 4434 NEW STANDARD Comparison of present standard class 2 pitch di- ameter tolerances with the new standard class 2A and 2B for -13 national coarse thread . external threads , such as on bolts and screws , and class 2B for ...
... STANDARD 4434 NEW STANDARD Comparison of present standard class 2 pitch di- ameter tolerances with the new standard class 2A and 2B for -13 national coarse thread . external threads , such as on bolts and screws , and class 2B for ...
Стр. 159
... standard . His inspectors will no doubt be instructed to accept either standard during the transition period , regardless of which specific standard may have been ordered . It would be simple , from the consumer's standpoint , if on a ...
... standard . His inspectors will no doubt be instructed to accept either standard during the transition period , regardless of which specific standard may have been ordered . It would be simple , from the consumer's standpoint , if on a ...
Содержание
SCIENCE | 4 |
TECHNICAL PAPERS | 26 |
The Validity of the Use of Tracers to Follow | 149 |
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