44 



The Dalhy Profile Recorder 



pencil P on the end of another arm. Mechanism connects the two arms 

 so that the vertical movement of R is changed into a horizontal movement 

 of the pencil in a direction at right angles to the direction of motion of 

 the stock. 



To draw a profile curve the stock is placed on the guide frame GG 

 and the mechanism is locked in a zero position by turning the milled 

 head L seen at the lower part of Fig*. 5. The roller is clamped clear of 

 the surface. The pencil is then lowered on to the paper and the stock 



Fig. 4 



is pushed along the guide rods by force applied to the handle JJ. The 

 pencil then draws a straight datum line. The roller is then lowered 

 into contact with the timber surface at a point of the path nearest to 

 a clamping point and this point is marked Z. This point defines the 

 position of the plane of reference, and the datum line already drawn lies 

 in it. The lock is then released by turning the head L and the stock is 

 drawn or pushed along the guide bars. The roller now follows the 

 unevenness of the surface along the path which it is compelled to follow 

 and the pencil P draws automatically the curve giving the shape of 



