100 



Mountain, Mining and Rccoiinoissaiicc Transit. 



On the opposite pagi- cut No. 4 represents a complete transit of this class. It is 

 In every respect similar to our Kiiginrrr.s' and Surveyors 1 lar-e transit except in si/.o 

 and weight. The verniers of the liori/.ontal circle will be generally at :J."> to line of 

 sight, except in No. 46, or similar cases, where -eiieral arrangement will permit of 90 

 verniers only. In both cases the plate levels will be of standard length and <-haracter. 

 The instrument is as carefully made as the larger ones and with careful use. necessary 

 only on account of its great lightness, capable of very accurate results. For use in 

 mines, mountains. BtC., and for preliminary work of all kinds, as well as to fill in details, 

 it is especially adapted. Owing to the smaller size of the telescope and its high p.w t r, 

 we supply the inverting kind. 



We are also prepared to make this size of instrument for travelers, explorers, etc., 

 of style shown in No. 4& when it is a transit-theodolite of the class shown on page 181, 

 but of style shown in No. 1 16, page 1N2. The standard frame is cast in a single 

 U-shaped piece to gain as much lateral stiffness as possible. The telescope can be re- 

 versed over the bearings by turning the upper covers aside, and also in the usual way 

 through the standards. In this instrument the graduation of the horizontal circle is 

 covered too, and the verniers are protected by glass, as in No. 4. There is no compass 

 needle. Instrument has a 4 /; full vertical circle with double opposite verniers as 

 shown on page 147. A level is attached to the vernier arm instead of to the telescope 

 as in No. 4 Striding level rests at points of contact, etc., as shown in the cut. This 

 instrument will only be made with three leveling screws. 



A more enlarged cut of this style of instrument can be seen by referring to style 

 1 16. Its cost of manufacture, however, is so high, as compared with No. 4, that we 

 are compelled to raise the price considerably when ordered in this style. However, 

 we believe that No. 4, having the advantage of a magnetic needle and containing all 

 the latest improvements possessed by the Engineers' and Surveyors' Transits, will in 

 most cases give equal satisfaction in every respect. We therefore advise our friends 

 to order No. 4. 



Both these instruments can be supplied with leather covers over the case, to be 

 strapped to the saddle of a horse. 



A chief danger may arise from its excessive lightness, it being apt to be overturned. Consequently careful 

 use is required. The regular tripod supplied with it is quite stiff and secures necessary rigidity, but the exten- 

 sion tripod designed for this instrument, desired by many, renders it more frail and unsteady. In all cases 

 where an extension tripod is ordered we recommend the purchase of a regular one in addition. A larger size 



extension tripod, weighing gj^ Ibs., as applied to our No. 2 Transit, can be used with a No. 4. The extra 

 weight incurred is more than balanced by the added stiffness. No extra charge if ordered in place < 

 gular 7^ lb. extension tripod. We prefer to send this out unless expressly ordered to the contrary. 



No. 4 Mountain, Mining- and Reconnoissance Transit. The dimen- 

 sions, etc., are as follows : 



Horizontal limb 4 inches; graduations on solid silver, double opposite verniers 

 reading to minutes; two rows of figures from to 360 ; glass-shades over verniers ; 

 needle 2| inches; vertical arc 4 inches; telescope 7 inches; aperture \\ inch; power 

 from 15 to 18 diameters ; 4-inch spirit-level, with clamp and tangent screw to telescope ; 

 vertical adjustment for the telescope axis ; shifting tripod; double centers ; split-leg 

 tripod, etc. 



The mahogany case has a leather strap, hooks, etc. It contains a sunshade, a 

 wrench, a screw driver, an adjustable plumb bob, a magnifying glass, an adjusting 

 pin, and weighs 4 Ibs. 



Weight of instrument 5 lb-. weight of tripod 5 Ibs. 



Gross weight of complete instrument, packed securely for shipment in 2 boxes, 29 Ibs. 

 Price of Mountain, Mining, etc. Transit No. 4, as above, $228. GO 



Price of Transit-Theodolite No. 4b as in cut, size as in No. 4, including 

 additional vertical wires if desired for solar observations, . . . $31O.OO 



No. 4b provided with a vertical arc or full circle, as in No. 4, level attached to telescope, . less $25.00 



No. 4b without detachable reading glasses, as in No. 4, 18.00 



No. 4b without striding level, as in No. 4, " 10.00 



Extras to Transits No. 4 and Xo. 4b. 



4-inch full vertical circle (in place of arc) with aluminum guard as in Moun- 

 tain Transit No. 3. $9.00 



Fixed stadia wires .... $3.00 



Prism ;ind rolon-d Classes lor solar observations, (improved mounting), . . PJ.no 



Short Focna Lena Attachment (see pages 118, 169). (MM; pair, . . . lu.oo 



Extra extension tripod, (weight 5 Ibs. ; see note to No. 3 Mountain Transits, . 13.00 



Leather cover over capo 9.50 



" with shoulder straps, J1.50 



Patent detachable side telescope with counterpoise, to transit No. 4, only, 



page 164, $35.00 



Patent interchangeable auxiliary telescope. To transit No. 4, only. Style I. 



p. 167 and lf,s, 45.00 



Silk bag to cov-r t ransit in case of rain or dust, 0.80 



Bottle of tine watch oil, 0.25 



(For Code Words for No. 4 Transit and above Kxtras see pages F, <i and H 

 of complete code at back). 



