88 0. E. SCHI0TZ. [NORW. POL. EXP. 



I assume from the foregoing, that as far as these observations are con- 

 cerned, there is no fear of any simultaneous movement other than those 

 imparted to the pendulum-stand itself, and these will increase the pendulum's 

 period of oscillation in the same manner wherever the apparatus is set up. 

 These observations may therefore safely be compared with those made in 

 the observatory in Christiania, where the pendulum apparatus was set up on 

 the iron cross in a window-recess in the thick brick wall. 



This I also assume must be the case with the observations taken in the 

 saloon of the Fram. In the first place, it may be remarked that the ship 

 at that time was frozen into the ice, and may thus be considered as 

 forming a part of the ice-covering. In the saloon, the apparatus, as 

 the drawing on page 4 shows, was set up in such a manner that the 

 pendulum swung across the ship, and consequently at right angles to the 

 planks of the floor, but parallel with the beams beneath them. As may be 

 seen from the plates accompanying Colin Archer's description of the Fram 1 , 

 there is a beam beneath the floor between the doors of the doctor's and 

 Scott-Hansen's cabins. According to the above-mentioned drawing on page 4, 

 the apparatus has stood above this beam during the observations. In 

 order to give the ship the necessary strength to resist the pressure of the ice 

 from the side, there were fitted under every beam in both decks, strong diagonal 

 stays, placed nearly at right angles to the side of the ship, and securely fastened 

 to the side and to the beam with wooden knees. The subjoined drawing 

 from Archer's description 2 , shows the relative position of the parts in a 

 section through the ship a little in front of the saloon. 



The width of the saloon between the two cabins mentioned above, accor- 

 ding to Archer's drawing, is 3'4 metres. The distance between the pendulum 

 apparatus and the coincidence apparatus differed a little in the different 

 observations, varying from 1932 to 2268 mm. The centre of the pendulum 

 apparatus was therefore between 60 and 70 cm. from the nearest wall, which 

 connected the upper and middle decks, and separated the cabins from the saloon. 

 If we take into consideration this fact, and also that the pendulum apparatus 

 was in direct contact with the floor, and immediately over one of the beams, 



1 The Norwegian North Polar Expedition 18931896, Scientific Results, edited by 

 F. Nansen. Vol. I. I, GOLIN ARCHER, The Fram; PI. II, figs. 1 & 2. 



2 1. c., PI. II, fig. 4. 



