Show PRESSURE AFFECTS GASA GAS CAS A A. A L H. Thiessen section director of the United Unite States Statu weather bureau hureau ye yesterday yes yei- r received from Washington the results of ot government Investigations In which tend to prove tb thet t gas sas explosions in mines have a distinct relation to atmospheric pressure ur Mr Jr Thiessen now plans plane to keep keel In touch with mine operators e especially when hen air pressure is 18 low and gases rush out and form torm an explosive mixture with other air |