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Page 180
Out of this grand total for six hundred and twenty - one inventions the Board , with the co - operation of the American Railway Association , which includes in its membership every road of importance in the United States , was able to ...
Out of this grand total for six hundred and twenty - one inventions the Board , with the co - operation of the American Railway Association , which includes in its membership every road of importance in the United States , was able to ...
Page 383
In the present method of operation , signal men located in towers and depots along the division operate the semaphore by levers under the telegraphic direction of the dispatcher . The term " semaphore " usually includes both the tower ...
In the present method of operation , signal men located in towers and depots along the division operate the semaphore by levers under the telegraphic direction of the dispatcher . The term " semaphore " usually includes both the tower ...
Page 442
The The dock is further equipped with steam dynamos yielding the current required for electric operation and an air compressor plant for repair purposes , so as to be entirely independent of the shore , being suitable for operation at ...
The The dock is further equipped with steam dynamos yielding the current required for electric operation and an air compressor plant for repair purposes , so as to be entirely independent of the shore , being suitable for operation at ...
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Contents
MAGAZINE | 586 |
Cover Design LEJAREN HILLER | 591 |
Men of SciencePORTRAITS | 605 |
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