C. L. Berger & Sons' Bracket for Transit or Level. 



This bracket is designed for supporting the instrument under conditions when the 



use of even our extension tripod is inadmissible, and will be found a valuable auxiliary 



for mining work. The instrument can be screwed upon the bracket, as on a tripod, and 



the transit can be centred above or below a given point. The bracket is made of brass, 



so fashioned as to offer the greatest rigidity, and is furnished with an auger and a lever. 



Price, One bracket made for Transit Xo. 4, with box, auger and lever . $14.00 



" " " " 6, " " " " " . 15.00 



Every additional bracket extra, for either size ..... 9.00 



Trivet of brass, to mount transit on, see Fig. Ill ..... 3.50 



Short Focus Lens Attachment.* 



The above cut of our wye level and Fig. II illustrate our patented Focus Lens 

 Attachment, attachable to the object end of the main telescope, which permits the 

 focusing of objects nearer than the range of the main telescope will permit. As a rule 

 the main telescope can be made only to focus objects five to six feet distant from 

 instrument. These lenses are generally furnished in pairs. Lens No. 1 will permit 

 focusing of objects about 4 feet from instrument. Lens No. 2 will permit focusing of 

 objects about 2-J- feet from instrument ; used together they permit focusing of objects 

 about two feet from instrument. 



The lenses are adjustable to the line of collimation of the main telescope and per- 

 mit of a high degree of accuracy. They will often prove of great convenience as an 

 auxiliary to view objects that are too near for observing without them. Attachable 

 to transits Nos. 1, 2, 3, 4, 5, 6, and to our wye and dumpy level. 

 Price, Lens No. 1 . . . . ..,...-.. . $8.50 



"2 . . . .... . . . . . 8.50 



" Lenses" 1 and Xo. 2 . ... . . . . . 16.00 



* See page 118 



