Maps produced by individual States. 109 



State Surveys. 



Neiv Hampshire. — This state supported recently a geologic sur- 

 vey, which undertook the preparation of a topographic map, a 

 work which was effected mainly, however, by compilation, little 

 original work being done. A number of positions in the state 

 were obtained from the United States Coast and Geodetic survey 

 and to these were fitted traverses of roads which had previously 

 been surveyed by private enterprise. Upon this skeleton a some- 

 what pretentious contour map was produced by using for heights 

 the profiles of the railroads of the state, supplemented by numer- 

 ous aneroid measurements made by the geologic survey. This 

 map was printed on a scale of 2 J miles to an inch with a con- 

 tour interval of 100 feet. It was issued in 1878. 



New York. — From 1877 to 1884 the state of New York main- 

 tained a survey under Mr J. T. Gardiner. By this survey much 

 triangulation of a high degree of accuracy was carried on, but 

 no topograjDhic work was executed. This state also maintained 

 for many years an organization known as the Adirondadc sur- 

 vey, which was instituted for the purpose of mapping the Adi- 

 rondack region. No results, however, have been published 

 beyond the positions of a fcAV geodetic points and a large number 

 of measurements of altitude. 



Pennsylvania. — In Pennsylvania considerable money has been 

 expended in topographic surveys for special purposes, but these 

 have been on so large a scale and are so detailed in character 

 that, areally, they are of slight importance. Most of them are 

 on the scale of 1,600 feet to an inch, in contours 10 gr 20 feet 

 apart. 



Wisconsin. — In Wisconsin some work was done in the south- 

 western part of the state by the state geologic survey. This work 

 was based on the triangulation of the United States Coast and 

 Geodetic survey. The Land office plats were utilized and the 

 relief was expressed by 50-foot contours. 



Minnesota. — Most of the area of Minnesota has been mapped 

 by the state geologic survey on a scale of 4 miles to an inch, in 

 50-foot contours. The horizontal element of this map was fur- 

 nished by the surveys of the General Land office, the vertical 

 element being supplied from the profiles of railroads, supple- 

 mented by aneroid measurements. 



Kentucky. — Drainage maps of many of the counties of Ken- 



le— Nat. Gkog. Mag., voi,. IV, 1892. 



