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Robert H. White was executed by hydrocyanic acid gas at the Nevada State Prison, June 2, 1930. A study of the heart and respiratory action was made at the time of the execution, a Bowles stethoscope being applied on the bare chest wall over the apex of the heart. The tube leading to the ear pieces on the outside of the prison wall was connected to the stethoscope while the prisoner was being strapped to the chair.
This was at 4:36 a. m. The heart action at that time was 108, strong and regular. The gas was started generating at 4:37½ At 4:38 the pulse rate was 120, regular and strong. A small inspiration was taken at 4:37¾ at which time the prisoner indicated that he smelled the gas. At 4:38 he took a very deep inspiration, turning his head toward the gas. He gave a spasmodic cough, his head
Hamer EE. THE EXECUTION OF ROBERT H. WHITE BY HYDROCYANIC ACID GAS. JAMA. 1930;95(9):661–662. doi:10.1001/jama.1930.27210090001008