Philipp Frank


Philipp Frank was a physicist, mathematician and also a philosopher during the first half of the 20th century. He was a logical-positivist, and a member of the Vienna Circle. He was influenced by Mach and was one of the Machists criticised by Lenin in Materialism and Empirio-criticism.

Early career

He studied physics at the University of Vienna and graduated in 1907 with a thesis in theoretical physics under the supervision of Ludwig Boltzmann. Albert Einstein recommended him as his successor for a professorship at the German Charles-Ferdinand University of Prague, a position which he held from 1912 until 1938.

Emigration to the USA

Frank, who was Jewish, fled to the United States after the German occupation of Prague. Frank became a lecturer on physics and mathematics at Harvard University.
In 1947 he founded the Institute for the Unity of Science as part of the American Academy of Arts and Sciences. This arose after Howard Mumford Jones had issued a call to overcome the fractionalization of knowledge, which he felt the AAAS well suited to address. The institute held regular meetings attracting a broad range of participants. Quine regarded the organisation as a "Vienna Circle in exile".
Astronomer Halton Arp described Frank's Philosophy of Science class at Harvard as being his favorite elective.

Frank on Mach's principle

In lectures given during World War II at Harvard, Frank attributed to Mach himself the following graphic expression of Mach's principle:
"When the subway jerks, it's the fixed stars that throw you down."
In commenting on this formulation of the principle, Frank pointed out that Mach chose the subway for his example because it shows that inertial effects are not shielded : The action of distant masses on the subway-rider's mass is direct and instantaneous. It is apparent why Mach's Principle, stated in this fashion, does not fit with Einstein's conception of the retardation of all distant action.