533 
pe N = 
di 
€ 
= 31 
= 32 
= 38 
=35 
7 1 sm 
ue I 
ERO =x 
= 4-9 
5 Uia By 
lUa. Hey 
15 Zi ay, 
i Dy idi 
X 21 = dans (Xy 
94 Las dens 
Urns Fay 
) 27 = itn suh 
) Tina (ris 
30 — bisa diei 
Uiirna l'ai 
à) 
Va pa Vans 
is) 
e 
(Xvi+1 = Xpia) tia 
(Yyit1 Eum Y pia) Uiq 
  
(Xy; +1 Xpia) t 
(Z Viet Zpiq) Via 
38 = 39 = id 
  
  
  
  
  
  
  
  
  
  
  
  
  
S riis (Yy 417 Yvi) t. 8 4 1)s (Zy14.1— 244) u 
gp —l.* 7 (i+1)s d (X X (i--1)8 —7 
S(i+1)s (Ziyi 41 ere vi) l4 1)s Vi4-1 vi) 
. e 
Q(4.1)5 (Xvi41 — Xy) v 
: : (i+1)s 
Fits (Yyı4ı — Yo) 
Iii) (Yyı4+ 1 — Yvi)], — Bacna /(Gvizi—2v) ü 
=, e. (i4-1)d . X X (i+1)a 
S(141)d (Zyi41 7 4 vi) di+1)a ( viti vi) 
. e 
dita Xyipr1—Xyy) 
: Y Vi+1)a 
ara Yvip1—Yy) 
  
  
Every other computation considered in the 2nd and 4th steps above are of obvious 
ni simple solution. 
The principal advantages of this method, as against any other analytical one, are the 
following 
a, It is sufficient to consider only six points for every photograph, as against nine 
herery other method. 
}, Itis not necessary to pass through the computation of the angular altitude of each 
juograph and carry out next the sizing of the new model to the previous one; this is 
uly obtained directly only by the computation of the new viewpoint, the co-ordinates 
{le two new passage points necessary to carry on the strip chaining. 
c The computations are made up of arithmetic operations only, absolutely excluding 
"Tu | te use of trigonometric tables. 
à. The computations are more quickly and simply done, and consist only of those that 
lad directly to the terrain points co-ordinates, useful, after the compensation, in helping 
fie plotting of the chain, pair by pair. 
Obviously all the overabundant elements, such as the points considered over those six 
essary and sufficient for every photograph, and the data obtained from the auxiliary 
isruments used in various methods of instrumental bridging, permit proceding to an 
Wer compensation in every stereogram; in particular some elements of this auxiliary 
iia (overabundant, or substituted at a passage point, if sufficient) introduce a reduction 
nthe degree of the problem and thus a simplification of the computations. 
  
  
iE TEC ECCE I E OUS