712 



WILLIAM HERBERT HOBBS 

 TABLE 11— Continued 



Station No. 



Station Name 



Lat. (N.) 



Long. (W.) 



Deflection 

 (Corrected) 



deflections in prime vertical (asimtjth) — Continued 



149 

 150 

 151 

 152 



153 



154 

 156 



159 



161 



235 

 248 



254 

 255 

 258 

 338 

 383 

 384 

 385 



Spencer 



Beaconpole 



Copecut 



Indian 



Shootflying 



Blue Hill 



Thompson 



Unkonoonuc. . . . 

 Agamenticus. . . . 



Davis 



Mt. Blue 



Gardiners Island . 

 Barnegat Inlet. . 



Cahas 



Chapel Hill 



Sankaty Head . . . 



High Point 



Womelsdorf 



41-41' 



42 



4i 43 

 41 26 



41 41 



42 13 

 42 37 



42 59 



43 13 



38 20 



44 44 

 41 6 



39 46 

 37 7 



40 24 



41 17 

 41 19 

 40 19 



71-30' 

 71 27 

 7i 4 

 70 41 



70 21 



71 7 

 70 44 



7i 35 

 70 42 



75 6 

 70 31 



72 6 

 74 6 

 80 1 

 74 4 

 69 58 

 74 40 



76 12 



45-3° 

 43-38 

 40.10 

 46.49 

 37-97 

 41.90 



40.35 

 37.98 

 41.42 

 48.87 

 37-15 

 37-42 

 40.78 

 38.07 

 44-23 

 37-71 

 40.99 

 40.98 



that a tendency to attain to isostatic adjustment exists within the 

 earth's outer shell as a consequence of diastrophic action, and that 

 at any given time large areas, such as the greater portion of the 

 United States, are measurably compensated. In areas more re- 

 cently disturbed and at a more rapid rate (western section of the 

 United States or the Himalaya region), which still betray their 

 lack of stability in earthquakes, no such state of isostatic compen- 

 sation can be postulated. Such regions show a rigidity sufficient 

 to support their excessive loads for long periods even if measured 

 in geological units, and if they yield to some extent through eventual 

 fatigue of the materials under strain, this effect lags far behind the 

 degrading effects of surface erosion and transportation. Some sug- 

 gestion of this idea appears to be found in the paper by Crosthwait. 1 



CRITICISM OF HECKER'S DETERMINATIONS OF GRAVITY OVER THE 



OPEN SEA 



Helmert's claim that gravity is nearly constant over deep water of 

 the ocean. — A line of evidence which has been held to support the 

 conception of isostatic compensation, but for the oceanic areas 



1 Op. cit., pp. 4-5- 



