OCEANOGRAPHICAL RESULTS, MICHAEL SARS^ 1900. 133 



This water-bottle insulated so well that if hauled up with 

 Dr. Hjort's steam winch with a velocity of from 120 to 150 m. 

 per minute, it would give temperatures even from 3000 m. with 

 an accuracy of the second decimal places of degrees Centigrade, 

 as far as I could make out. 



Unfortunately this water-bottle was lost by an accident on 

 August 9th, 1900. 



A similar great insulated water-bottle for oceanic work was 

 constructed by Prof. Pettersson and myself and was made by 

 the firm Ericsson & Co. of Stockholm. It was of much the 

 same principle as the above-mentioned instrument, except that 

 it was not insulated by evacuated glass tubes but had instead 

 an insulating layer of india-rubber outside. It had no arrange- 

 ment with excentric levers for pressing the lid down, and was 

 not therefore so absolutely watertight as the above-mentioned 

 instrument, but was nevertheless very good. It was arranged 

 for fixed thermometers as above, and these were always used. 



This water-bottle, of which we had three specimens on 

 board, worked very well and proved to insulate almost as per- 

 fectly as the above mentioned bottle. It seemed to give the 

 temperature with perfect accuracy from 3000 m. 



For the newest model of a smaller type, Ericsson has now 

 also on my suggestion applied an arrangement with excentric 

 levers similar to what is mentioned above, so that the water- 

 bottle is closed perfectly with absolute certainty when it is 

 once shut. 



We had on board two small insulated water-bottles of 

 Pettersson's original pattern. I had one of these instruments 

 altered, so that a deep-sea thermometer of my above mentioned 

 pattern could be fixed in the lid; this was an important impro- 

 vement which saved time and at the some time greatly in- 

 creased the accuracy of the determinations of the temperature. 

 This water-bottle was used for lesser depths down to several 

 hundred metres. 



