Roentgen ammeter for X-ray tubes ...
Subtitle: The only instrument which accurately measures the effective current that passes through an X-ray tube. Also, it detects the presence of "inverse" current, and indicates the rise or fall in vacuum of a tube. "The value of this instrument as a basis for comparing technique in radiotherapy cannot be overestimated. Its invention makes a marked advance in treatment possible."
Publisher: James G. Biddle
Published: 1905
Place of publication: Philadelphia
Language: eng
Subjects: Electric meters
Notes: Cover-title.

At head of title: January, 1905, 540.