165 



Style II. 

 With Adjustable Trivet 



Complete Mining Transit, 



with C. L. Berger & Sons' Patent Adjustable and Interchangeable Auxiliary Telescope (Style II). 



(For -use as top and side telescoped) 



Size as in Nos. 5, 6 and 7. For general description, price and attachments see page 162. 

 For full description and adjustments see pages 106 and 107. 



NOTE. The fact that this auxiliary telescope, though intended chiefly for the measurement of horizontal 

 angles in steep mines, can also be used as a side telescope for measuring vertical angles, obviating the 

 necessity of corrections for eccentricity in either case, we feel, will be appreciated by the Mining Engineer, 

 who under trying circumstances in the mine must have often felt the need of just such an accessory. 



As shown in the cut above, the verniers are placed at an angle of 35 to the line of sight (unless ordered to be 

 at 90), in consequence of which the front plate level, being of standard length and form, is carried some little 

 distance beyond plates, which at times may render it less convenient to read, and although protected by a 

 guard, renders it more liable to slight derangements. For reasons stated on opposite page, a striding level 

 might be ordered, but as with this style of instrument a striding level cannot be applied, we can place instead 

 a fixed auxiliary level on the main telescope, near the eye end, which will perform the duty of a striding level, 

 assuring the rotation of the telescope in a vertical plane when best results in very steep sighting are desired. 



Its adjustment, however, is dependent on that of the telescope in the vertical plane. This latter must be 

 verified, as explained on page 51, before this level can be adjusted by reversing, as in the case of the plate 

 levels. For price, see striding level "Extras," p. 162. 



