Professor Demonstrates Own Invention That will be of Great
Assistance to Hospitals and Physicians--Sounds of
Body Magnified Many Times and Made Audible.

[Special to The Indianapolis News]

LAFAYETTE, Ind., October 28.-- Before an audience of Lafayette physicians and surgeons and a few guests, Professor R. B. Abbott of the physics department at Purdue University, Friday evening demonstrated his new invention. The apparatus is a vacuum tube stethoscope that amplifies the sound of heart beats so that they may be heard the length and breadth of the largest hall at the university.

The device is said to be superior to anything of its kind. It will be of great assistance to hospitals and physicians in detecting heart and lung diseases. Sounds of the body are magnified many times and made audible.

The magna vox equipment of a radio receiving station was used by Mr. Abbott to demonstrate his device. He showed that with one amplifying tube the heart beat could be heard only a few feet away. With two tubes a room full of persons could hear it, and with three tubes it could be heard distinctly over one of the largest halls at Purdue.

Mr. Abbott announced that the apparatus had been used to make photographic records of the heart action of a number of athletes and persons with irregular heart beats. He reproduced the heart beats of his son, age seven, and of O. L. McIlvaine, of Rush county, a senior in the university's wireless broadcasting station.

A phonodyke and rotating mirror were used to trace on a screen a large scale diagram of the variations of loudness of the heart beats.

The instrument also amplifies the sound of a watch ticking until the sound became a loud rapping and persons in the audience were able to hear the wheels turning inside their watches.

[From The Indianapolis News, October 28, 1922. Photo added by B. Abbott]