Field Note Book Crocker Land Expedition 1913-1915 No. 53 Seismograph, 1916-1917
Page 12
Image from the Biodiversity Heritage Library. Contributed by American Museum of Natural History Library. | www.biodiversitylibrary.org
Transcription
8 3. Nov. Off at 10.0.30 No record. Magnet stopped from 3.01-3.06 - Marked at 6,7+8 and then ceased altogether. On at 10:4:30 - Not marking - Temp. 21.7° min 18° - no heat Wound clock at 10:10 - Tested battery and clock with tell tale telegraph sounder - Both O.K. 4. Nov. Off at 10:40 a.m. Temp 22° min 19° stove not burning 24 hrs. No record. Magnet did not work till 1:45 yesterday when I adjusted screw and it worked all right till 7 this morning. Then with occasional breaks till 10 a. m. then mostly off to 10:29 - then ok again On at 10:44:30 a.m. Marking etc changed to no damping at 3 p.m. The connecting arms (Hebel arms) are adjusted as when received and the little thrust pins are on the second points from the outer ends of the needle arms giving a magnification of 80(?) In all respects the adjustment of the apparatus is exactly as when received except for strengthening the pole on the armature of the magnet and reducing the distance through which armature moves and increasing pull of spiral