158 



Mountain Transit. 



No. 3. Mountain Transit. Size as in No. 2. Provided with an extension 

 tripod. This instrument is well adapted for use in mountainous regions, chiefly on 

 account of its smaller size, lightness and great portability. Its work is as accurate 

 as that of larger instruments of its clasSo Its weight is 10 Ibs., with an ordinary 

 tripod complete ll>> Ibs., but when provided with an extension tripod three pounds 

 are added to this weight. The graduations are on solid silver verniers reading to 

 minutes; ground glass shades; 5-inch vertical circle with aluminum guard; s{>irH- 

 level clamp and gradienterto telescope; protection to object slide; r/-/rx/o// tripod pro- 

 vided with thumb-nuts, etc. 



The mahogany case has a leather strap hooks, etc. It contains a sun-shade, a 

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

 pin, and weighs 7 Ibs. 



Gross weight of instrument, packed securely for shipment in 2 boxes, about 4o 

 Ibs. 

 Price, complete as above, with cloth finished standards . . $257.OO 



This instrument with a 5-inch vertical arc in place of the full circle and 



^ it liout aluminum guard LeaM 



Stan darcls finished like instrument (no clothfinish) .... extra <>.< >o 

 A reduction of $15.00 from the above price is made if the graduations are not on 



solid silver. 



Extras to Mountain Transit. 



Offsetting arrangement, 5.00 



Stadia wires, fixed, 3.00 



Variation Plate, . 10.00 



Quick leveling attachment (see manual), 8.00 



Extra regular tripod, for use with instrument in ordinary practice, . 16.00 



Davis' Solar Attachments, all complete, . 18-00 



C. L. Berger & Sons' Solar Attachment (pp. 154 and 155) . . . 68.00 



Latitude Level " 15.00 



*I'rism, with colored glasses, for observing the sun's altitude, .... 12.00 



Short Focus Lens Attachment (see pages 118, 100). One pair, . . . UJ.oo 



Leather cover over case, to be strapped to the saddle of a horse, . 12.00 



" " " " as above with shoulder straps, ..... 14.00 



Silk bag, to protect the instrument in case of nun <>r .lust, . . . . 1 .<>< 



Bottle of fine watch oil, for the centers of transit, 0.25 



NOTE. Although the extension tripod is very slender and about albs heavier than our regular tripod, its 

 superiority for mountain work is very apparent on account of its adaptation to sudden changes in grades, -jtill, 

 for general practice, it is desirable to have the regular tripod, insuring, as it does, L-rcati r steadiness, and con- 

 sequently giving increased accuracy. The surveyor will therefore find it to his advantage to order both kinds. 

 It will be observed that in the cut the verniers of the horizontal circle are placed at an angle of 35 "> to the line 

 of sight as in our Mining Transits, thus adapting the instrument to the work in a mountainous country. On 

 the other hand this change in the position of the verniers requires the level in front of the telescope to be 

 carried beyond the limit of the plate in order to be of standard length and character, and although fully pro- 

 tected in its partially exposed position from injury, by an improved guard surrounding it, it is, nevertheless, 

 subject to slight changes in adjustment, as when compared with one mounted as shown in Transit No. 2, where 

 verniers are placed at 1X) to the telescope. In all cases where this change in the position of the verniers is not 

 deemed of sufficient importance, we advise to order our Transit No. '2. A small striding level, illustrated in 

 Transit No. Id, can also be placed upon the telescope axis at an extra cost of $15.00. No extra charge if the 

 telescope is ordered to be of the inverting kind when the whole instrument will have to be made specially. 

 The aperture will then be 1% inch, the power '2'2 diameter. 



* In a mountainous country, it frequently happens that a transit must be set up in places where ft is ex- 

 tremely difficult to get standing room to take both back and fore-sights. With the aid of a prism* attachable to 

 the eye-piece, all this can be done from the side of the instrument. 



