THERMAL CONDUCTIVITIES OF ROCKS 265 



Temperature Measurements in Boreholes in the Vicinity of Hamburg. 



By E. Koch. 

 Mitteilungen aus dem Mineralogisch-Geologischen Staatsinstitut Hamburg, 



Heft XIV, 1933, pp. 53-8o. 

 The results of thirty-one temperature measurements carried out by the 

 author since 1920 are discussed. Maximum thermometers manufactured 

 by Carl Kramer of Freiburg-i.-Br. were used. 



The results of measurements are divided into three groups, according to 

 the geothermal gradients : 



1. From 29 to 39 m. per i° C. 



2. Less than 29 m. per i° C. 



3. More than 39 m. per i° C. 



Take Temperature of Well in Jackson Gas Area. 



(Editorial Note.) 

 The Oil Weekly, Houston, vol. 69, no. 13, 1933, p. 61. 

 The article gives the readings taken recently by Dr. C. E. van Orstrand 

 in a well in the Jackson (Miss.) gas field, which had gone dead. 



The well is Cleve Love et al's Muse-Cotton 1, located 1,360 ft. north 

 and 770 ft. west centre, section i4-5n-ie, Rankin County, south-east part 

 of the field, which is practically on top of the Jackson igneous plug and 

 at the point of maximum magnetic force. The temperature readings were 

 as follows : 



Feet °F. Feet ° F. 



100 664 1,250 99'5 



250 70-8 1,500 106-6 



500 78-1 1,750 113-7 



750 84-2 2,000 120 -6 



1,000 93-1 2,250 126-7 



Some Comments on the Measurements and Interpretation of Deep- 

 Earth Temperatures. 



By C. E. van Orstrand. 



Gerlands Beitrdge zur Geophysik, Ergdnzungshefte fur angewandte Geophysik, 

 vol. 3, no. 3, 1933, pp. 261-281. 



A brief description is given of the apparatus used by the United States 

 Geological Survey and the American Petroleum Institute in conducting 

 recent geothermal surveys. 



As a result of tests in 700 wells located chiefly in producing oil fields, 

 instances have been found in which the isogeothermal surfaces rise in 

 passing over salt domes, faults, sand lenses, and structures of large and 

 small closure. In central Oklahoma, there is in addition to the local 

 variations a regional variation that seems to be determined largely by the 

 depth to the granite. 



Underground Temperature on a Hill Top. 

 By Yosio Kodaira. 

 The Geophysical Magazine, Tokyo, vol. 5, no. 1, 1932, pp. 89-95. 

 The present paper contains the results of mathematical investigations on 

 the underground temperatures observed on a hill top and of those at the 

 same depth in a level tract of land. 



