5370 



Prof. NECKER on the Determination of the 



Fig. 2. 





Fig. 3. 



t 



The Figures 2. and 3. are intended to show, that whatsoever 

 may be the direction of the horizontal projection of the seams, 

 and whatever may be the position of the vertical plane of the draw- 

 ing in relation to these projections, the same process will lead to 

 the wished-for result, 



