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Article SCIENTIFIC INTELLIGENCE. ← Page 2 of 4 →
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Scientific Intelligence.
Oise , being 20 leagues from the spot where I ascended . I made this passage in one hour and three quarters . ' Tbe aeronaut concludes with an observation respecting the utility of his ait . — ' Proceeding at the same rate , ( he says ) and in the same diiecnon , I could in less than ei ght hours have carried an order from Paris for the Dutch fleet to sail from the Texel . ' TUNKEL UNDER THE THAMES .
THE following is a description of a communication between the counties of Kent and Essex , projected by Mr . R . DODD , Engineer , to be effected by a Tunnel under the River Thames from Gravesend to Tilbury . The communication is proposed by the projector to be a cylindrical tunnel , to be constructed wholly with key-stones ; therefore , the greater the pressure , the stronger will be the work . The diameter to be 16 feet in the clear , which Mr . D . imagines will be sufficient for foot , horse , and carriage
passengers—the passage to be illuminated with lamps , and a steam-engine to be erected in a proper situation to draw off the drainage water , if any should accumulate . The expence of this stupendous undertaking is estimated at so low a sum as 15 , 955 ! . for 900 yards of tunnelling , relaying the bottom , lamps , lampirons , steam-engine , pipes , and other necessary machinery . This projected measure will save a circuitous route of 50 miles bland ;
y the distance from Gravesend t © Tilbury , crossing London Bridge . Independent of the advantage it would afford " to commercial establishments and agricultural improvements , the general benefit to the counties of Kent and Essex must be immense . Mr . Dodd is of opinion , that whether the measure is considered as a great national improvement , or a local one to the two counties , or forming a military post , of the first consequence in that part ofthe kingdom , for enabling
troops , & c . to pass through , its importance claims the greatest attention . Another question he suggests , is , what may be the-most proper method of raising the supplies to defray the expence of the undertaking : —whether by the joint expence of both counties , or by a subscription of private individuals , incorporated by Parliament , with , authority to levy tolls ? , The latter mode , he is convinced , would be beneficial to the individuals , and amply repay the share-holders . The following are the estimates ofthe expence , as suggested by Mr . Dodd , in the first instance :
To 900 yards ( running measure ) of tunnelling , including excavations , vaulting with key-stones , & c . at ill . per yard , - £ io , ? co To re-laying the bottom with new made ground , cjooyards , at il . each , 900 To placing lamps and lamp-irons through the Tunnel , Collectors ' rooms , and gates at each end , - - - 400 To mating good the entrance roads , at each end of the Tunnel - 160 To a steam-engine to draw oil' drainage water - - 1780 Kecessary machinery , during ihe execution , - 500
To ten percent , upon the whole for contingencies ,. - 1413 Total , 15 , 955 A similar Tunnel to the above was to have been made , many years ago , by a Mr . Calvert , under the Severn , at the Old Passage near Chepstow ; but , owing to the death ofthe projector , it was relinquished . NAVIGATION . A discovery has b . tel y been made , -which promises the most important cuiscquences to navigation . It consists of a compass and latitude instru-
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
Scientific Intelligence.
Oise , being 20 leagues from the spot where I ascended . I made this passage in one hour and three quarters . ' Tbe aeronaut concludes with an observation respecting the utility of his ait . — ' Proceeding at the same rate , ( he says ) and in the same diiecnon , I could in less than ei ght hours have carried an order from Paris for the Dutch fleet to sail from the Texel . ' TUNKEL UNDER THE THAMES .
THE following is a description of a communication between the counties of Kent and Essex , projected by Mr . R . DODD , Engineer , to be effected by a Tunnel under the River Thames from Gravesend to Tilbury . The communication is proposed by the projector to be a cylindrical tunnel , to be constructed wholly with key-stones ; therefore , the greater the pressure , the stronger will be the work . The diameter to be 16 feet in the clear , which Mr . D . imagines will be sufficient for foot , horse , and carriage
passengers—the passage to be illuminated with lamps , and a steam-engine to be erected in a proper situation to draw off the drainage water , if any should accumulate . The expence of this stupendous undertaking is estimated at so low a sum as 15 , 955 ! . for 900 yards of tunnelling , relaying the bottom , lamps , lampirons , steam-engine , pipes , and other necessary machinery . This projected measure will save a circuitous route of 50 miles bland ;
y the distance from Gravesend t © Tilbury , crossing London Bridge . Independent of the advantage it would afford " to commercial establishments and agricultural improvements , the general benefit to the counties of Kent and Essex must be immense . Mr . Dodd is of opinion , that whether the measure is considered as a great national improvement , or a local one to the two counties , or forming a military post , of the first consequence in that part ofthe kingdom , for enabling
troops , & c . to pass through , its importance claims the greatest attention . Another question he suggests , is , what may be the-most proper method of raising the supplies to defray the expence of the undertaking : —whether by the joint expence of both counties , or by a subscription of private individuals , incorporated by Parliament , with , authority to levy tolls ? , The latter mode , he is convinced , would be beneficial to the individuals , and amply repay the share-holders . The following are the estimates ofthe expence , as suggested by Mr . Dodd , in the first instance :
To 900 yards ( running measure ) of tunnelling , including excavations , vaulting with key-stones , & c . at ill . per yard , - £ io , ? co To re-laying the bottom with new made ground , cjooyards , at il . each , 900 To placing lamps and lamp-irons through the Tunnel , Collectors ' rooms , and gates at each end , - - - 400 To mating good the entrance roads , at each end of the Tunnel - 160 To a steam-engine to draw oil' drainage water - - 1780 Kecessary machinery , during ihe execution , - 500
To ten percent , upon the whole for contingencies ,. - 1413 Total , 15 , 955 A similar Tunnel to the above was to have been made , many years ago , by a Mr . Calvert , under the Severn , at the Old Passage near Chepstow ; but , owing to the death ofthe projector , it was relinquished . NAVIGATION . A discovery has b . tel y been made , -which promises the most important cuiscquences to navigation . It consists of a compass and latitude instru-