NO. 8.] PENDULUM OBSERVATIONS. 25 



Observer, Lieutenant SCOTT-HANSEN. 



Khabarova. 

 July 30th, 1893; afternoon. 



The place of observation was situated about 500 metres WNW by com- 

 pass of the Russian church, whose latitude was determined by Nordenskiold 

 to be 69 38' 50" N., and longitude 60 19' 49" E. of Greenwich. 



The apparatus was set up on a crag of slate on the shore to the north 

 of Sibiriakoff's warehouse. The pendulum clock was hung up on a packing- 

 case of which one end was sunk into the tundra, and partly filled with 

 shingle. The lower edge of the glass case that was put over the pendulum 

 apparatus was lined with asbestos packing, and during the observations, 

 water was placed round the foot, and Lieut. Scott-Hansen further laid his 

 cloak over it. The wind was south-westerly, and the sky half overcast. 

 There was no opportunity of determining the rate of the chronometer by 

 time observations. The barometer-readings were taken by an aneroid Perkins- 

 Rayment 1298, which was compared before and after with a mercurial 

 barometer, Adie 764. Scott-Hansen is uncertain whether thermometer 23 or 

 24 was used for the observations. The difference between the two thermo- 

 meters in the same reading is, as we have seen on page 9, 



23 24 = reading X 0.085 1,053; 



so that the temperature corresponding to a given reading, may differ between 

 0.40 and 0.67, according to which of the two thermometers was used. 

 I have supposed that thermometer 23 was used in this case as subse- 

 quently. The observations, however, are not very trustworthy, on account 

 of the rapid rise in temperature that took place. 



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