NOTES AND MEMORANDA. 



321 



ancT on I, A may be swung sideways in either direction to the right 

 or left either below or above the stage, the axis of revolution of which 

 is the line X Y, that is, a line in the plane of the object to be viewed 

 on the stage C, intersected by the optical axis of the instrument, that 

 is, the line N 0, passing through the centre of the body and the 



object-glass of the microscope. The stage C is also attached to S by 

 the pin C\ terminated by the screen C^, which pin passes through 

 the centre of the socket I, and turns therein so that the stage C may 

 be made to turn in either direction in conjunction with or independent 

 of A, the axis of its revolution being also the line X Y. 



By this arrangement the stage C and the stem A may be set at an 

 angle to the axis of the microscope either below or above X Y, inter- 

 secting the plane of the object to be viewed and also relative to each 

 other, and when so set the stage C may be clamped at the desired 

 angle by the nut D on the screw C^, acting on S and the collar K. 



The specification then proceeds (in the language usual in such 

 cases) : — 



" Having thus particularly described and ascertained the nature 

 of the said invention and the manner in which the same may be per- 

 formed or carried into effect, I would remark that I am aware that 

 microscopes have been heretofore made in which a stem or tail-piece 

 has been applied so as to swing from a centre situate below the plane 

 of the object stage, and therefore no claim is herein made in general 



VOL. II. Y 



