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3) lack of mutual eccentricities between the axes converging to the 
Cardan coupling centre, i. e. the primary and secondary rotational axes, the 
rod axis and the short rod axis; 
4) parallelism between the rod and short rod axes; 
5) lack of respective bendings between the rod and the short rod in 
any position and with any slope of the projection organ. 
1) Straightness of the rod. — The observation of the straightness of the 
rod made it necessary to previously check its taper and irregularities of its 
section. The results obtained ascertained that, excepting some small irre- 
gularities in the upper part, which is not utilized, the variation in diameter 
is lower than 5 p.m. The straightness of the rod axis was then checked by 
means of an appropriate device. This was used to measure the position chan- 
ges, with respect to two opposite terminal sections, of the centre of five inter- 
mediate sections. 
'The results of these measurements are collected in fig. 13/a; the rods cur- 
vature has a maximum deflection of about 8 yu m (left rod) and 10 y m (right 
rod). 
  
  
  
  
  
  
  
  
  
  
  
  
  
Rod Left Right 
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Fig. 13/a - Curvature of the rod 
  
  
  
   
  
  
   
     
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