I. SURVEYING. 729 



2956. Distance and Angle Measuring Telescope Ruler 



(Kippregel), construction of 1874, by Breithaupt, No. 97. 



2957. Distance and Angle Measuring Telescope Boiler 



(Kippregel), construction of 187o, by Sprenger, No. 108. 



2958. Surveyor's Plane Table, old construction, by Bau- 

 inann, No. 53. 



2959. Surveyor's Plane Table, improved construction, by 

 Baumann, No. 82. 



2960. Surveyor's Plane Table, construction of 1874, by 

 Breithaupt, No. 91. 



2961. Surveyor's Plane Table, construction of 1875, by 

 Sprenger, No. 113. 



2962. Two Surveyor's Plane Tables. Prepared for sur- 

 veying. 



2963. Two Surveyor's Plane Tables. 

 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 Royal Survey lays 

 down the network of triangles, and gives the geographical longitude, lati- 

 tude, and elevation of each individual trigonometrical point to the Topo- 

 graphical Department, in a similar form to that shown in No. 2962. This 

 sheet (section Kalisch) contains the trigoAometrical points which are marked 

 thus " ," the station being at the point of intersection of the two lines. 

 The minute network drawn upon the sheet is on the scale of 1 : 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 theirs* 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 OF 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. 



