. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. / .fi\\ The greatest angle of elevation being at B, we shall according to the foregoing directions produce A B and C B. Elevation at A = aG 22' (J7"'93 nat. cot. = 1'357911U â B r= IS" 45' j0"-o3 â ^ 0-S7G54'32 C = 39" U' 2ii"-91 â = 1-2345G7S tio that the lines AO, BO, CO, are respectively to each other As l-3679no : : : As the three'sides of the triangle ABC are given, the angle ABC^FBGis found to be G7' 22' 4S"-5. 1-35791
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. / .fi\\ The greatest angle of elevation being at B, we shall according to the foregoing directions produce A B and C B. Elevation at A = aG 22' (J7"'93 nat. cot. = 1'357911U â B r= IS" 45' j0"-o3 â ^ 0-S7G54'32 C = 39" U' 2ii"-91 â = 1-2345G7S tio that the lines AO, BO, CO, are respectively to each other As l-3679no : : : As the three'sides of the triangle ABC are given, the angle ABC^FBGis found to be G7' 22' 4S"-5. 1-3579110 + -8765432 = , log. = U'34'.I1714 â .S7Go432 â 0-4813678, log. = 1-0824770 * 9-968351G, sub. log. to 0-031G4sl 1-234507S + â¢8765432^ 2-1111110, log. =: + .8705432 â 0-358024G, log. = T 0-1215701, sub. lug. to 1-S7&4239 .â¢...^-_.,.. . , To find UO. â "" Log. A B = lug. 402 - 2-604642O ~ (A O); log. 1-3579110 := 0-1328713 (O B); log. 0-8765432 := 1-9427733 "" * sub. log. found above 9-9G83516 G O = 511-2557 . .. log. :^ 2-7086382 To find G B. Log. A B ^ log. 402 ^ 2-6646420 Twice log. of -8765432 = 1-8S55466 Sub. log. before used â 9-96835IG G B =; 330-02 log =: 2-5185402 To_fi»d F O. Log. C B r:: log. 429 '. ' â 2-6324573 (O Cj; log. 1-234567S ~ 0-U915150 (O B) ; log. 0-87G5132 ^ 1-9427733 t sub. log. found abovL' â U-1215761 FO^ 614-2167 log = 2-78S3217 To find F B. = log. 429 j â 2-63-24573 Twicelog. of 0-8765432 â 1-8S55466 t sub. log ^ 0-1215761 F B = .... log = 2-6395800 â ~ â ' To find the angles BG F and BFG. B F =: 436-094 436-094 B G = 330-020 330-020 Sum = 766>114 Dittereucc = FBG= 07°22'48"-5. As 766-114 sub. log. = 7-116706S ⢠106-074 log. = 2-0256090 : : tan, 56° IS' 35" J log. tan. =10-1760912 ; ° 43' 57"? .log. tan. ='9-3174068 . - . 56° 18' 35"? + ir 43' 57"3 = 08° 2' 33"i = B G F, and 5
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