Simple method of testing camera shutter speeds for between℗Ư-the℗Ư-lens shutters.

Bibliographic Details

Corporate Author:	United States. Bureau of Entomology and Plant Quarantine
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1938.
Subjects:	Measuring instruments. Photography. Insects. Entomology.
Online Access:	Electronic resource (PDF)