ir,2 



Mining Transits. 



All of the foregoing instruments, particularly No. 2 and No. 4 we recommend for 



general underground work. (The latter icstruiucnis chidlv on n.-cuunt <>t their mv;m-r 

 ~ portability and lightness.) The telescope may be ciihcr inverting or erect, and may 

 have a prism attachable to the ordinary erecting or invrning . \c-piece to facilitate 

 J5 sighting in inclined shafts. We frequently attach to the cross-arid u side telescope, 

 g swinging free of the plates, of nearly the same lenuiii and power, which permits of 

 vertical sighting up or down a shaft (see cut p. 164, also pp. 104 to 106). We ;ilso furnish 

 "g attached above and parallel with the line of sight of. the main telescope of Nos. 4, ,"> and 

 6, another one of shorter length and lesser power mounted on a central pillar firmly 

 *j secured by means of a threaded stud to the cross-axis of the main teleseope, as in Style 

 JEJ, II; or cast on, as in Style I. (See interchangeable auxiliary telescope, pp. 1 ''", I '''. 

 6 also pp. 106,107.) 



This latter telescope, which of necessity is of lesser power as compared with our 

 3 regular side telescope, will in most cases be deemed sufficient, as sights in mines are 

 M short. Its power varies from 8 to 15 diameters, according as the telescope is erecting or 

 ~ inverting. We are, however, prepared to mount one of same length as our n-gular side 

 5 telescope in cases where a complete revolution of cross-axis is not required. Jn our 

 M improved style No. II, the top telescope can be truly set parallel with the line of sight of 

 " the main telescope by means of adjusting screws. It will be seen that vertical sighting 

 up or down a shaft can be done with ease and accuracy, and this latest device has nearly 

 all the advantages of a telescope mounted on inclined standards with none of its faults, 

 O and is second only to our Universal Duplex Mining Transit, in so far as it entails the use 

 $ of an auxiliary telescope of lesser power. When not in use the auxiliary telescope may 

 *? be removed at will and stored in the box. In style II, the central pillar may be lett on 

 ft the instrument or taken off at pleasure. In the latter case only the stem lor the coun- 

 terpoise on the under side of the telescope remains attached. But in Style I, which we 

 now strongly recommend, the central stem is permanent, as explained above. As will be 

 seen by reference to the description and cuts of this device, pp. 106,107 and 16"), iho, 

 ~ auxiliary telescope cnn also be rendily attached to thn end of the cross-axis of our 

 Mining Transits No. 4 and No. 6 when it becomes a side telescope. The ready interchange- 



*^ ability from top to side makes the auxiliary telescope one of the most desirable additions to a Mining Transit. 

 To avoid errors in reading cardinal points, the compass ring is figured from to 360, the same as the 

 ,rt horizontal circle. Mining instruments should have large vernier openings to admit of as much light as pos- 

 <w sible, and all graduations should be on solid silver. For the illumination of the cross-wires, a small reflector 

 "S is sometimes placed in the centre of the cross-axis of the telescope of our larger instruments ; but as in the 

 smaller telescopes much light is being cut out by its use, we prefer to attach a reflector shade in front of the 

 Q object glass. The tripod is provided with three adjustable legs to permit of raising or lowering the instru- 

 ment in cramped places. 



No. 5. Milling' Transit. Dimensions as in No. 1 (unusual large size) ; 

 J graduations on solid silver; * verniers reading to minutes are provided with (jmiiml yiux* 

 shades; 5-inch full vertical circle; spirit-level, clamp and tangent screw /<> tt-lfxcope; 



* extension tripod, etc. Price, $253.OO. 



No. 6. Milling' Transit. Dimensions as in No. 2 (customary size); 

 graduations on *>li<l sttver;* verniers reading to minutes ur<- jirurnlvl n'i/// yrunn<l 

 A glass shades; 5-inch full vertical circle ; spirit-level, clamp and tti.mjnil .srw/' to tele- 

 scope ; extension tripod, etc. Price, $253.OO. 



* A reduction of $15.00 "will be made if the graduations are not on solid silver. 



~ Extras to Mining Transits Nos. 4, (>, and 7. 



Striding level (for description and illustration, see pp. 56, 148, and 178) 20.00 



Stadia wires, fixed 



J Disappearing cross and stadia wires (pp. 81, 165") Patented ''."" 



^ Gradienter attachment for Nos. 5 and 6 . . . . . 



* Five-inch vertical circle provided with double opposite verniers (see p. 14 /) , . . . _ . 20.00 

 S Edge graduation for vertical circle with a double vernier at eye-end, which is glass-covered, as in 



3 cut (p. Ittr,/,) extra 



< Edge graduation for vertical circle with double opposite verniers (p. 1 l,i . . extra 



U Patent short focus lens (pp. Us, KJ'J, ]-\ K . II). . . No. 1, #8.50 ; No. 2, $8.50 ; Nos. 1 and 2 



^ Reflector for illuminating the cross-wires . 



Sj Aluminum guard to vertical circle 



Prism, attachable to eye-piece . 



Detachable side telescope with counterpoise (p. 164) :;..nn 



S Patent interchangeable auxiliary telescope. Style I, described on p. 107 and shm\n on p. H'.T, ot 



superior construction ; strongly advise it in place of Style 1 1 j > - ll 



O Patent adjustable and interchangeable auxiliary telescope. Style II, p. 166 "."" 



*" Patent equatorial adapter for solar observations, striding level, prism with colored gnu, and dia- 



- phragm with square of coarse wires (p. His) 



g Arrangement for offsetting at right angles to telescope 



fe. Quick leveling attachment 



^ Half-length tripod 



3 Extra extension tripod 



O " split-leg tripod (see note to No. 3) 



> Plummet lamp (large size) 



g " (small size) 



E* Bracket in box, with strap, auger, and lever (Fig. I, on p. 169) 



^ Trivet having legs 2, 4, or inches long, (Fig. Ill, p. 169) . . . *{ 



Plumbing device for carrying a line down a shaft (p. 165J), $4.00 each ; per pair .... 



Patent Lateral Adjuster (p. 1<;r,/,j ''"-'! 



Large plumb bob, weight 4 Ibs., for use in shatts 



Bottle of fine watch oil ~. 



Silk bag, to cover transit . . . .*'Jg 



Leather case for No. 4, with or without shoulder straps /,",,," ', 



" " for No. (',, with or without shoulder straps . l-.OO to 14 



NOTE. The object prism, as sometimes used to enable steep sighting in mines with the ordinary transit 



telescope, is not enumerated here for reasons stated on p. 27. 



