183 





No. 12. 

 8-inch Transit for Triangulation. 



As made by C. L. Berger & Sons. 



12. The form of frame chosen for mounting the telescope is as in the cut, 

 which permits the reversal of the telescope through the standards, as well as over 

 the bearings. 



The inverting telescope has a clear aperture of 1)4 inches, and is of 11 inches 

 focal length, and has a power of 20, 25 or 30 diameters as ordered. It is provided 

 with a 5 inch vertical arc, graduated to read to minutes, a 4) inch striding level 

 to rest on the pivots of its axis, a 6 inch spirit-level (parallel to line of collimation) 

 together with a reversible clamp and tangent screw. The horizontal circle is 8 in. 

 in diameter, opposite verniers reading to 10. The verniers are glass covered. This 

 instrument has three leveling screws which have a larger base than is usual, and the 

 tripod-head being proportionately large the instrument has great stability. 

 Weight of instrument 16 Ibs. ; weight of tripod 12 Ibs. 



Price, as above, $45O. 



This instrument without arc and clamp to telescope, $50.00 less. 



