Full text: Tracé des chemins de fer, routes et canaux

  
  
    
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Considérons le triangle AFG (n° 5.) 
Les côtés AG et FG nous seront donnés par les proportions : 
sin. G : AF :: sin. F: AG 
sin. G: AF:: sin. A: FG, 
d’où l’on a : 
log. AG 2.7417878 d’où AG—=551r 81 
log. sin. F== log. sin. 65° £0’ ==\9.9595964% 
log. AF == log. 473295 — SE 
eompl.log. sin. G==compl. log.sin. 51°30'==10.1064556 
log. sin. A == log. sin. 62°50’ — 9.949239) 
log. FG == 2.7314263 d’ou FG=—=538™ 80 
  
Triangle FGH (n° 6.) 
log. FH —2.7015958 d’où FH —503"03 
log. sin. G—log. sin. 68° 35’ = /9.9689262 
log. FG — log. 538" 80 —/2.7314263 
compl, log. sin. H —— compl. siu. 889 40! — 0.0012433 
log. sim. F zz log. sin. 959 45’— 9.6379351 
log. GH == 2.3706047 d'ou GH zz934m 75 
  
  
Triangle FIH (n° 7.) 
log. FI 2.8261896 d’où FIZ26700 17 
log. sin. H == log. sin. 18^ 09 = fa 101500 
  
log. FH — log. 503" 03 2—42.7015958 
compl.log.sin. I —— eompl. log.sin.47990'—2 50.41335301 
log. sin. Flog. sin. 31° 05°’ 9.7128889/ 
log. HI = 2.5480148 d’où HI==353"20 
  
Triangle HIJ (n° 8.) 
log. I 2.6294333 d’où IJ426"02 
log. són. H— log. sin. 89° 40* = ( 9.9999927 
log. IH = log. 3537 20 = vast 
  
compl log.sin. J== compl. log. sin. 56° 00'==1 0.081 4258 
log. sin. I==log. sin. 34° 20’ = 9.7512842 
log. JH = 2.3807248 d’oùJH240"28 
  
    
   
    
     
  
  
   
     
  
  
   
    
   
       
 
	        
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