124 



Mr. F. L, 0. Wadsworth on a 



really constitutes all of the essential parts of the new catheto- 

 meter, the telescope-mounting itself— consisting of the two L- 

 shapedbars K, G and the adjusting screws H, I— being merely 



Yv?. 1. 



Fig. 2. 



accessory to the convenient adjustment of the axis C to verti- 

 cally. An ordinary open V-clamp M attached to the lower 

 bar G enables the whole arrangement to be clamped to any 

 convenient support; such, for example, as the upright of a 

 heavy retort-stand^ or an iron wall-bracket or even a stiff well- 

 secured water- or gas-pipe on the wall of the laboratory. If a 

 retort-stand or other support with adjusting screws in its base 

 is used, the adjustable support G, K, &c, on the telescope 



