45, CORNHILL, E.G., AND 122, BEGENT STREET, W., LONDON. 



FIG. 10. 



FIG. 11. 



6. Cathetometer,^ (fig. 10.) Improved arrangement, suited for 

 Observing Stations of the First Class. Price 50 to 80 ; varying with the 

 fineness and accuracy of the divisions and the number of adjustments attached 

 to the instrument. 



