III. SURVEYING. 771 



3144. Deep-sea Water-raising Apparatus, according to 

 Dr. Meyer. 



Ministerial Commission for the Scientific Examination of 

 the German Seas, Kiel. 



3145. Deep-sea Water-raising Apparatus, according to 

 Prof. Dr. Jacobsen. 



Ministerial Commission for the Scientific Examination of 



the German Seas, Kiel. 



Intended to bring up with certainty a sample of water from any depth iu 

 the sea. 



3146. Deep-sea Water-raising Apparatus. 



L. Steger, Kiel. 



3147. Map Drawing Instrument. A. Bonsack, Berlin. 



Instruments of this kind have come into use in the province of Schleswig- 

 Holstein. 



3148. Coast Station Areometer Case. 



Ministerial Commission for the Scientific Examination of 



the German Seas, Kiel. 



The Station' Areometer gives the specific gravity of sea water compared 

 with distilled water of + 14 R. within 0-0001. 



3149. Two Sets of Ship Areometer Cases, for oceanic 

 voyages. 



Ministerial Commission for the Scientific Examination of 



the German Seas, Kiel. 



The Ship Areometer gives but half as accurate results as the preceding ; 

 it is characterised by its shortness, which renders manipulation more con- 

 venient on board ship. 



3150. Two Sets of Ship Areometer Cases, for voyages 

 in the east part of the Baltic. 



Ministerial Commission for the Scientific Examination of 



the German Seas, Kiel. 



3145. Slow-Thermometer, in ebonite, for measuring the 

 temperature of the sea. 



Ministerial Commission for the Scientific Examination of 



the German Seas, Kiel. 



The Sloiv Thermometer furnishes very accurate readings when it can re- 

 main in the water for an hour. For moderate depths it is more certain, 

 cheaper, and more durable than registering instruments. 



3 145 a. Apparatus for ascertaining the Temperature of 

 the Sea at various depths. 



J. L. IV. Dietrichson, Christiania, Norway. 



The temperature of the sea at different depths cannot always be ascertained 

 with a maximum and minimum thermometer, because it does not constantly 

 increase or decrease with increase of depth. 



Supposing the temperature to be: at the surface, 15; at 200 metres, 6; 

 at 400 metres, 8, it would not be possible to gauge this last temperature 

 with a maximum and minimum thermometer. 



An apparatus, must then be used which shall, in the water and out of the 

 water, preserve the observation taken at the depth. 



3 C 2 



