Report on the Danmark expedition to the north-east coast. 75 



In the astronomical observatory (Astr. Obs.) stood the large 

 theodolite of the Expedition on a heavy granite support, which was 

 cemented fast to the rock. Electric wires (Lys-Ledn.) were set up 

 by Chr. Bendix Thostrup from some dry cells in the villa to the 

 observatory, so that both observer and writer could have electric 

 light. The large theodolite was used to determine the daily time, 

 for the determination of the longitude and latitude, investigation 

 of sidereal and terrestrial light refraction and some special observations. 



The meteorological work was served by quite a number of in- 

 stallations. 



The thermometer box (Thermometerskab), which stood about 2 4 

 meters above the ground, contained the thermograph, maximum 

 and minimum thermometers, dry and moist thermometers, aspirator 

 and often a hair hygrometer. 



Halfway between the thermometer box and wind-vane (Vind- 

 fløj) a pole was fixed in the ground (Anemometer); on this a small 

 hand anemometer, which was kept in the villa, was placed daily. The 

 force of the wind was also measured on the vane which had a special 

 arrangement for this purpose. 



The rain and snow fall was collected each morning at 8 a. m. 

 from the rain-guage (Regnmaaler). 



For the investigation of the temperature, moisture, direction 

 and force of the wind in the high atmosphere, kites and — in calm 

 weather — balloons were used. The kites were kept, when folded up, 

 in a couple of large boxes (Dragekasser) and, naturally, had to be 

 fitted together each day before use. During the winter this work 

 was very troublesome and gave rise to considerable risk of frost-bites; 

 in the autumn of 1907, therefore, a large shed (Drageskur) was built 

 which could hold 3 kites all ready for ascent. 



The two balloons ^ were kept in a wooden box (Ballon). They 

 were filled with hydrogen, which in greatly compressed condition 

 had been carried up in 100 large steel holders (Brintflasker). 



Both kites and balloons were provided before ascending with 

 thermograph, barograph and hydrograph, all in one instrument. They 

 were connected with the ground by means of piano Avire 12 kilometers 

 long, which was rolled on a drum with a hand-winch (Dragespil). 



A special use was made of the crow's nest (Udkigstønden) on 

 the maintop. In each month a series of continuous meteorological 

 observations Avere taken every other hour during a diurnal period 

 at the thermometer box, 10 cm. above the ice and in the crow's nest. 

 The aim with these series was a special study of a low-lying tempera- 

 ture inversion, which had been determined from the kite ascents. 



In connection with the meteorological installations at the winter 

 quarters, there was also a field station erected on the adjacent 132- 



1 A 3rfl balloon had bfcn lost from the breaking: of the connecting- wire. 



