718 EEPORT — 1891. 



survey resources might be utilised during the processes of laying out the pre* 

 liminary lines of triangulation. From this triangulation the extension of topo- 

 graphy would thereafter probably depend on private enterprise. 



Then follows a short consideration of the general topographical processes as 

 carried out by natives of India, of the value of such native labour, and of the 

 possibiUty of raising survey establishments in Africa similar to those which have 

 done such excellent work in Asia. 



6. Bar- Subtense Survey} By Colonel Henry Tanner, Indian Survey. 



The paper dealt with a system of survey carried out by Colonel Tanner during 

 the past four years in the Punjab Himalayas, with suggestions as to its adapt- 

 ability for isolated surveys of unexplored countries. 



SATURDAY, AUGUST 22. 



The following Paper was read : — 



1. Suggestions for the Revision and Improvement of the Large Scale Maps of 

 the Ordnance Survey. By Henry T. Crook, G.E. 



Reforms having been promised in the Ordnance Survey productions, it is desira- 

 ble to consider whether the large scale plans and maps answer the requirements of 

 those who chiefly use them, namely, engineers, geologists, and other scientific men, 

 and those engaged in the administration of imperial and local affairs. The purposes 

 which the Cadastral Survey has to subserve are constantly increasing with the 

 advance of scientific knowledge. It is admitted that the production of this class of 

 maps is a proper function of Government. The efficiency of the organisation and 

 the accuracy of the work done by the survey department is not disputed, but there 

 is room for much improvement in the style of maps published, and in the amoimt 

 of information conveyed. No adequate provision has been made for the revision 

 of the survey, and in consequence a very large portion of the maps is obsolete. 

 The author makes suggestions for clearing off the arrears of revision work, and for 

 maintaining the survey maps reasonably up to daie. He proposes that the country 

 should be divided into districts under superintendents, each district ofiice being 

 charged with the revision of the maps of its district within a limited period. He 

 suggests that the services of these district offices might be at the disposal of anyone 

 requiring plans or maps with manuscript corrections up to date on payment of 

 suitable fees. He thinks by these means the cost of maintaining the survey would 

 be materially reduced. Then follow some suggestions for improving the six-inch 

 county maps, and he concludes by urging that the scale of prices should be revised, 

 and that better indexes should be provided for the different maps. 



2, Mr. Eavenstein explained a Series of Maps illustrating his 

 Presidential Address to the Section. 



3. A Local Collection of Maps was described by the Librarian of the 

 Public Library. 



, ' Printed in the Proceedinns of the Royal Geographical Society, p. 675, November 

 1891. 



