OCR Text |
Show 1222 REPORT OF THE CHIEF OF ENGINEERS, REDUCTION OF OBSERVATIONS. The following corrections are applied to the number of rods multiplied by 20 feet: ( 1) Difference of rod from 20 feet at mean temperature of all observations multiplied by the number of rods measured. ( 2) Keadings of both ends of wooden rod when lying on the plates. ( 3) Correction for inclination. The following table contains the corrections for ( 1): First ^ measurement. Date. September 23 1 88 October 24. 25. Sfi. 27. 28. 29. 30. 1. 2. 3. 4. 104 104 54 109 102 104 111 105 96 108 110 72 g § 5=* Inches. - 101.5457 - 102. 1987 - 5* 6305 - 106.5279 - 101.6022 - 102.1061 - 108.8337 - 102.9000 - 95.3392 - 104.8734 - 106.8146 - 70.4318 First measurement, 1,181 rods- 1,155.2558 inches. Second measurement. Date. October 5 7 10 11 17 18 1 ean tempera 3 92 97 92.5 83 88 58 63 57 i umber of measured. « 144 151 152 150 145 129 148 150 s § CJt*. a o l! Ill « Inehe*. 144. 8357 146.1710 147. 7516 151.9637 141.5302 129.3945 139. 4297 141.7125 Second measurement, 1,179 rods - 1,142.4090 inches. |