At the 1926 Ido conference in Cassel, he startled many listeners by delivering a presentation on the naturalistic auxiliary language Occidental.

He published two monographs on cosmology in Interlingua, Problematica del cosmologia moderne and Astro-Geologia.

In the second work, he endeavored to solve fundamental problems of geology, such as the origins of mountains and oceans, using the exact method of physics and his own theory of planetary interference.

Later, Pigal persuaded professor Eugen Wüster, also of Austria, to use Interlingua in his work to standardize international scientific terminology.

This work led to the founding of the powerful International Organization for Standardization (ISO).