Sgt iy eee ait thenaE a re ial teeB Bn oa edit ing the direct stayed within a zone bordered on the northeast by a line parallel MACK track at a distance of 2 miles and bordered on the southwest by a line paralleling of 1 mile. he direct track at a distance “eek within 045°. BE 005° (60 or 05)- Timee 2156 Absolute times are correct within 10 minutes. Time intervals (between successive allowing for the fact that occasionally time was lobeervations ) are correct within 3 minutes, ‘Opure See General Notes entered at the start of the observations although usually it was entered immediately upon their ¢onclusion. Y experienced - TT. 5 is correct within 0.2° F. in instances in which it was read to the nearest tenth of a degree and within 0.4 when read to the nearest half degree (.0 or .5). These estimates are based on the fact that the thermometer specifications call for an accuracy of within 0.1] and on ' trace adjusted to rit® the assumptions that this initial tolerance held and that the observer correctly read the 0.1 within O.l. hin wn in the Table are all thermometer TT and TT. were read to the nearest and thermograph read. ' — — | (see discussion under Notes, Table 4}. 5 footnotes to the -he bi-hourly Values, at least every TABLE 16. BETWEEN BRUCE, KEITH, ELMER: half-degree (.0 or .5) and are correct within 0.5° LAGOON TRAVERSES. Locations of the observations can be estimated by assuming straight-line courses between the islets and by spacing the observation points along these lines with distances proportional to elapsed times between observations. to within 5 minutes. In most instances this will locate the observation point correctly to within 700 yards and in all instances it will locate the point correctly to within 1500 yards. Times are absolutely correct within 10 minutes (180th meridian time) and differences between successive times are correct within ] minute, Temperatures were measured with different types of thermometers at different times, and the accuracy varied accordingly. August20. Details are as follows: Both air and water temperatures were measured with a mercury-in-glass thermometer, unjacketed, graduated in half-degrees C. and temperatures were estimated to 0.1° C. Values were later converted to the nearest 0.1° F. for water temperatures and the nearest 0.5° F. for air temperatures. Assuming no bias or instrumental error beyond the initial thermometer tolerance, TT, values are accurate within 0.4° F. and TT values, within 0.6° Fe 5 On August 26th, August23. For all observations through that taken at 1420, the instrument, procedures, "e been a few and accuracies were the same as for August 20 (above). erence to the 1015 thermometer graduated in whole degrees F. was used. bted at BRUCE, eatinated TT; to the nearest 0.1° F. and TT to the nearest half-degree Fe (.0 or «5). 47 ermne crm oe re at ern tongs From 1430 onward, a metal jacketed Using this thermometer, the observer . 5 : Since aa MRT em akene eee