Ludwig Tesdorpf, Stuttgart. 127 



Upper sole-plate: tribrach, upon which the apparatus may be mounted 

 in a two-fold manner: 



1. for use as a tachy metrical theodolite, in all cases where the 

 tachymeter is screwed directly upon this plate; 



2. for use as a tachymetrical transit theodolite, in cases where the 

 surveying-table M is brought into requisition. 



Surveying-table M with rollers S and ratched wheels A for conveniently 

 stretching the drawing-paper. 



Note: Upon one of the rollers the finished drawing is rolled up, whilst 

 the other roller deals out fresh paper. The rollers are for this purpose made 

 to move laterally in order that in such cases where the drawing envolves con- 

 siderable curves it may be displaced sufficiently to I'eep the vertical pressure of 

 the apparatus near the axis of the lower structure. 



Vid. Jordan, Zeitschrift fiir Vermessungsivesen u . 1886. Heft 14 and 16. 



No. 2. Large Compass Theodolite with repeating arrangement. 

 Horizontal limb of 20 centimeter diameter, with hood and glass -covers 

 above verniers. Vertical circle of 17 centimeter diameter of opening. 

 Both circles divided on silver in 1/6, reading by verniers to 10 sec. 

 directly or 5" by estimation. The vertical circle has besides / divisions, 

 and its rim is divided by deeply cut lines in 1/2 throughout; figured 

 in terms of zenith distance for better finding fixed stars for geographical 

 orientation. The compass has a needle of 12 centimeter length. The 

 telescope is made to freely revolve on its axis ; it has an aperture of 33 

 millimeter and magnifies 36 times; there are two oculars (1 orthoscopic 

 and 1 inverting ocular for zenith readings), and 2 sun-shades; the telescope 

 axis is traversed by webs, fitted with lamp at side and central reflector 

 for illuminating the field. Crossed levels on alhidada of horizontal limb. 

 Alhidada level with micrometer adjustment for altitude circle; striding 

 level with correction screws resting upon carneol cylinders. Mounted on 

 English model stand. See Fig. 5. 



Packed in two cases of polished walnut, containing also plummet, screw- 

 driver, camel-hair brush and lubricating oil. 



No. 3. Repetition Theodolite. Horizontal spoked circle of 17 centi- 

 meter diameter, vertical circle of 12 centimeter diameter, divided on silver 

 in 1/3, two verniers reading to 20'', by estimation to 10". Both circles 

 with metal hood and glass covering. Telescope magnifying 30 times. 

 Diameter of objective 32 millimeters. Orthoscopic ocular. Telescope- 

 level, pillar-level and striding level. Alhidada level for the altitude circle. 

 Tesdorpf's tripod horizontal adjustment. See Fig. 4. 



Packed in polished walnut case, with necessary fittings and stand. 



No. 4. Compass Theodolite, similar to No. 5. Horizontal circle 

 12 centimeter diameter, divided in 1/3: vertical circle of 10 centimeter 

 diameter divided in 1/3, reading to 20". Compass needle of 5, 5 centi- 

 meter length; lamp. Tripod with Tesdorpf's horizontal adjustment. 

 Stand and case. See Fig. 2. 



Note: The Theodolites No. 2. 4. 5. 6. have besides divisions in %. 

 like No. 20. 



