Reprinted from RADIOLOGY, Journal of the Radiological Society of North America, April, 1931, Vol. XVI. P. 486
A NEW DIAPHRAGM FOR THE COMPLETE ELIMI-
NATION OF SECONDARY RADIATION
By A. L. SORESI, M.D., Visiting Surgeon, Greenpoint Hospital

Consulting Surgeon, Bushwick Hospital
Visiting Surgcon,
Parkway Hospital, BROOKLYN, N. Y.