— 56 



Map No 3.— Uru- 

 guayan shore of 

 the Upper River 

 Plate. 



Map N° 4.— Outer 

 Road-; ofBuenos 

 Aires. Year 1903. 



Map N» 5. — Fa- 

 rallon Bar, Scale 

 1 : 40000. 



Map X° 6. — New 

 Channel, scale 

 1:100000. Year 

 1903. 



3. Model of i he 

 Graving Dock 

 of the Port 

 of Buenos Ai- 

 res. 



4. Luminous Buoy- 

 ing of the 1 ii 

 trance Chantv U 

 to the Port of 

 Buonos Aires. 



Nation up to 1903, and embraces the upper part of the 

 River Plate. 



This survey has been carried out with great care by 

 means of a great number of soundings and cross sections, 

 and close observation of tides. An excellent triangulation 

 covers completely the studied zone. This plan also contains 

 the position of all the signals for navigation that exist on 

 the River. 



The problem of the interior navigation of the Parana- and 

 Uruguay Rivers being based on the navigability of the 

 channels near the Uruguayan shore of the Upper River 

 Plate, this map has therefore been prepared on a large 

 scale which allows it to be perfectly studied, there being 

 an abundance of details. 



This map, drawn to the scale of 1:40000, embraces the 

 part of the River Plate in front of the City of Buenos Aires, 

 including its Port, the access channels, and the manner in 

 which the latter have been marked with buoys and beacons. 



This map embraces with many details the zone of the 

 River Plate where there is less depth in the route of na- 

 vigation of ocean vessels. All the buoys and the position 

 of all rocks that may be dangerous to navigation in the 

 proximity of the Farallon ( Colonia Lighthouse ) are in- 

 dicated. 



This channel was buoyed for the first time in the year 

 1892, the passing of vessels and the effects of the current 

 have produced a natural excavation of 3 feet. This channel 

 has at present 19 feet at low water, and the luminous 

 buoys greatly facilitate its navigation. 



The port of Buenos Aires has two graving docks, one 180 

 meters and the other 150 meters long. This model repre- 

 sents with all details the largest of the two to a scale of 

 1:100. It shows the culverts for emptying the dock, the 

 engine house, the floating caisson and all details of its 

 construction. 



This plan indicates in detai] aU the signals, luminous- and 

 other buoys and beacons that mark the access channels to 

 the Port of Buenos Aires, the position of the Semaphore 

 and the form bf sinnnls most commonly used for the 

 buoying. 



