THE tidal observations in Danmarks Havn were begun by the 

 Captain of the vessel, First-lieutenant Alf Trolle, later the 

 leader of the Expedition. 



The observations were started on October 3rd under the super- 

 vision of First-lieutenant Trolle, he himself or the watchman noting 

 down the height of the water. This was observed on a long pole 

 divided into meters and centimeters, which was let down through 

 the fire-hole in the ice at the stern, so that the distance of the sur- 

 face from the bottom could be read off directly. This method of 

 determining the height of the water proved , however , to be primi- 

 tive and inexact and the director of the observations was thus obliged 

 to find a more systematic and reliable apparatus. 



With the assistance of the engineer Weinschenck and the boat- 

 swain G. Thostrup the following arrangement was fixed up. 



A davit with pulley was set up at the stern of the ship ; over 

 this passed a thin steel wire with a heavy sack full of stones at the 



'"^^ 



one end, which, led down through the opening to the bottom, formed 

 the fixed point of the apparatus. From the pulley on the davit the 

 wire was led through a hole in the door of the companion, built in 



