File:Model of a compressed air shield as used for the Pensylvania Railroad Tunnels in NYC area.jpg
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English: Sectinal model of a compressed air tunneling shield as used for the Pennsylvania Railroad Tunnels in the New York City area |
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| Date | circa 1922 | ||||
| Source | Bertram Henry Majendie Hewett, Sigvald Johannesson and others: Shield and compressed air tunneling, McGraw-Hill book Co, 1922, p. 227, fig. 103 | ||||
| Author | Unknown author | ||||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:20, 29 February 2020 | | 1,571 × 960 (161 KB) | Pechristener (talk | contribs) | {{Information |description={{en|Sectinal model of a compressed air tunneling shield as used for the Pennsylvania Railroad Tunnels in the New York City area}} |date={{otherdate|ca|1922}} |source=Bertram Henry Majendie Hewett, Sigvald Johannesson and others: ''Shield and compressed air tunneling'', McGraw-Hill book Co, 1922, p. 227, fig. 103 |author={{unknown|author}} |permission={{PD-old-1923}} |other versions= }} Category:Compressed air tunneling |
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