have suc- 
a 
— 
e 
rs which 
the same 
ientation 
Tables II 
)XÀ byi . 
  
  
  
  
Table III 
  
  
4, — Condition equations. 
With Roleofs’ notations, we have for the Stereocartograph the follow- 
ing formulas : 
y? ol 72 
dp = "ETF de; — xdxı + (bidx + dbyı) — À doi’ + 
Z 
3. tr do. 4- dbz) 
Z i 
dp' = — OE (Ao; rm Aci e 1) ——X (Axi mS Axi’ = 1) = (bi Axi d 
Xy y 
T Abyi — Abyi - 1) + m (Agi — Agi - 1) + + (biAe; + 
d Abz; — Abz; is 1) ° 
The condition dp’ = dp is fulfilled by : 
doi = Aoi —Aoi- , 
dx; = Ax; — Axi - 1 
bdxi + dby; = biAx + Abyi c Abyi x 
doi — Agi — Agi - , 
bde; + dbz; = biAgi + Abz; — Abz; - , . 
Roelofs’ paper shows at paragraphs 4-5-6 the procedure by which 
we arrive at the following seven condition equations : 
[doi] — Aes — Ao,— W, 
[du]; — Ax, — Ax,— W, 
[dei] — An — Ag,— We 
     
   
   
   
  
    
     
      
    
     
   
   
    
   
    
matt