6i 



MEMORANDA. 



2. 





In planning the nose-piece I made patterns of millboard, 



of various shapes and projeetions, 

 one of ^vllich extended beyond 

 the stage ; but this appeared in 

 the way, and, as my object glasses 

 would work together over the 

 stage without danger from touch- 

 ing it, I began on the same scale 

 as the double one, which, also, I 

 nearly copied in the connexion 

 with the body, adding a heel 

 (Diagram 2), to secure the objec- 

 tive in its place while being used. 



Diagram 1 gives the whole piece (underneath), and as 



being moved for change of power. This, and Diagram 2, 

 are about real size. 



Diagrams, half size. The 

 3. letters are the same in all 



three. 



a. The adapter, with 

 milled head, to screw the 

 nose-piece to the body; 



b, the noses, in which the 

 object glasses are screwed; 



c, a pivot on which the 

 piece holding the objectives revolves; screw head regulating 

 its tightness; d, (Diagram 2) a small bolt passing through 

 the heel, as shown by dotted lines. This bolt is driven by a 

 fragment of watch spring into a corresponding hole in the 

 nose (Diagram 1 ^), on the object glass arriving at its place. 

 The other dotted lines indicate a hole drilled nearly through. 



