- 62 — 



3. Plans of the gra- 

 ving Dock and 

 anexed tidal Ba- 



4. Normal sections 

 of the principal 

 works. 



houses for employees, barracks, and is also ready the first 

 section of the Naval Hospital with 80 beds and in position 

 of receiving 400 in case of war. 



The Naval Station is provided with waterworks, sewara- 

 ge, electric ligth, and usual installations for the service of a 

 dockyard. 



Also a small town has almost sprung up round the dock- 

 yard in here in 1898 there was a complete desert. 



This plan shows the principal dimensions and details of 

 the dry clock, 222 m. long, 27 in. wide at the entrance and 

 10 m. deep on the cill, at ordinary high tides. 



This plan shows the s} T stem of construction of the dry 

 dock, built entirely of concrete made of portland cement, 

 sand and gravel, with a facing of granite so that the gene- 

 ral aspect of the dry dock is as if it were built entirely of 

 granite. Thus it combines the durability of granite with a 

 moderate expense and rapidity of construction. 



The dry dock can be pumped out in 2 y a hours by means 

 of two large centrifugal pumps, driven each one by a 

 400 H.P. compound engine; the clock is also provided with 

 hydraulic capstans and cranes, electric light, water mains, 

 railway service, etc. The entrance is closed by a sliding 

 caissoon removed by hydraulic power in 3 minutes. There 

 is also an intermediate floating caisson for the internal di- 

 visions or for the porpose of leaving dry the sliding caissoon 

 when this needs paitimr. 



This plan shows the general outlines and dimensions of 

 the most important works, that is: 



a) Entrance channel, dredged with 80 m. width at the 

 bottom, and depth of 32' at O. H. W. and 21' at 

 O. L. W. 



b) Pumping-engine house and sliding caissoon with 

 its recess. 



c) Diagram showing the dimensions of the largest 

 vessels afloat in comparison with the dimensions 



of the graving 



dock. 



d) System of construction of the graving clock, in its 

 various periods. 



e) Details of the sliding caissoon at the entrance of 

 the dry dock. 



