608 SEC. 15. GEOGRAPHY. 



2957. Distance Measuring Plumb-line (construction of 

 1875, by Sprenger, No. 108), with magnifying glass, screw-driver, 

 screw-pin, and dust brush. 



2958. Surveyor's Table Stand (ancient construction, by 

 Baumann, No. 53), and three screws in the transport case. 



2959. Surveyor's Table Stand (improved construction, by 

 Baumann, No. 82). 



2960. Surveyor's Table Stand (construction of 1874, by 

 Breithaupt, No. 91), with case for the staff-head, and three screws 

 in the transport case. 



2961. Surveyor's Table Stand (construction of 1875, by 

 Sprenger, No. 113). 



2962. Surveyor's Two Table Boards, with oilcloth cover, 

 in a leather bag. 



2963. Surveyor's Two Table Boards, without oilcloth, in 

 a leather bag. 



2264. Distance Staff. 



2965. Universal Instrument, latest construction. 



With such instruments as these the topographical survey of Prussia is 

 carried on. The Trigonometrical Department of the lloyal Survey lays 

 down the network of triangles, and gives to each individual trigonometric 

 point its geographical longitude and latitude, and its elevation according to 

 the Trigonometrical Department, in a similar form to that shown in No. 2962. 

 This sheet (section Kalisch) contains the trigonometrical points which are 

 marked thus " ," the station being at the point of intersection of the two 

 lines. The minute net drawn upon the sheet is on the scale of ! 25,000, to 

 which the topographical surveys are executed. 



The surface covered by each section between 54 and 55 N. lat. amounts 

 to about 2 '2 square (German) miles. 



The position of the square in the sections in relation to the degree net is 

 shown by the two general tables appended to No. 2962. Here the section 

 Kalisch is coloured red. 



The Universal Instrument (2965) is one of the instruments used for 

 measuring the angles of the triangles of the first order by the Trigonometrical 

 Department of the Royal Land Survey. The one here exhibited was taken 

 out to Kerguelen's Land by the expedition for observing the transit of Venus. 



SECRETARY OF STATE FOR INDIA. 



PHOTOGRAPHS OP INSTRUMENTS USED FOR THE GREAT TRIGO- 

 NOMETRICAL SURVEY OF INDIA. 



2966. Photographs of the Great Theodolite for the great 

 trigonometrical survey of India. Designed by Lieut.-Colonel 

 A. Strange, F.R.S. 



