242 



Subsurface Geologic Methods 



single sample is run at a time. Since each run requires several hours in- 

 cluding cooling time, a maximum of about three samples a day may be 

 analyzed. To overcome this difi&culty, as well as to provide a simultaneous 



Figure 100. Complete multiple-differential thermal-analysis unit. 



comparative record, a multiple-thermal-analysis unit was designed.^^ The 

 various parts of the equipment were assembled late in November 1946 



°* Kulp, J. L., and Kerr, P. F., Multiple Thermal Analyses: Science, vol. 105, no. 2729, p. 413, 1947. 



