Ask ninety-nine people what the Eastman Kodak Company makes and they'll say "Film, papers and cameras, of course." But ask the hundredth fellow, the doctor, and likely as not he'll answer "Dupli-Tized Film." Because of this company's activities in the field of x-ray photography the name Eastman is almost as well known in the medical world as it is among photographers.

X-rays and ordinary light differ in penetrating power. For example black paper, which keeps out daylight, doesn't discourage the x-ray. It is their penetrating power which makes x-rays valuable in medicine but it also offers obstacles to photography. Emulsions that absorb ordinary light strongly,scarcely stop the x-ray at all. From the very start x-ray photography called for new emulsions.

These special emulsions were worked out at Kodak Park. At the same time an x-ray department was created within the Research Laboratory to conduct definite experiments on the use of x-ray materials.

With the aid of information placed at their disposal by the laboratory, the emulsion makers were soon able to improve their product and by 1916 the Seed X-ray Plate was standard throughout the American medical profession. Yet that was but a single step along the road that has been covered thus far.

In The Field Of Medicine StudioLightMagazine1923 85

PORTRAIT FILM NEGATIVE, VITAVA PRINT

By Francis J. Sipprell Buffalo, N. Y..

During war time the army medical services of all countries were interested in the use of x-rays in casualty cases. They demanded a small, portable, low-powered generating unit to carry into the advance area. But not until the Eastman company succeeded in producing a super-sensitive x-ray film was this type of unit practicable.

The introduction of this film was a tremendous achievement. Its super-sensitive emulsion is coated on both sides, cutting down the exposure and increasing density and also permitting the use of two intensifying screens.

While this film was first produced for the United States Army-its use so furthered x-ray technique that it was quickly adopted in all practice. To-day Dupli-Tized Film has almost entirely superseded x-ray plates.

The Eastman company's conquest in the medical field was not achieved by magic, of course, but rather by many years of investigation. A Medical Division was organized, to keep in contact with the photographic needs of hospitals, physicians, surgeons and dentists. This division now has representatives in the field demonstrating the findings of the Kodak Park X-ray Laboratory.

In addition to experimental work this laboratory is active in practice, under direction of the company's medical staff. For example, a "chest survey" was made of 2000 employes who elected to take a free medical examination last year.

Contrary to general opinion, bone fracture cases comprise but a small part of x-ray work as practised today. X-ray photography is now considered indispensable in almost all hospital diagnoses, for examination of lungs, the gastro-intestinal tract, kidneys - the entire field of clinical investigation.

In addition to evolving Dupli-Tized Film the company has worked out special apparatus to simplify x-ray practice, including an exposure scale, intensifying screens, developing tanks, etc.

The scope of the Medical Division has recently been extended to other phases of clinical photography, not concerning x-rays. A special camera for medical use has already been announced. And in addition there are many other applications of photography in medicine, such as photomicrography, electro-cardiography (photographic registration of heart beats) and clinical motion pictures. The Division is constantly collecting experimental data in these fields and the findings are now available to the medical profession.

The fact that its commercial activity in this branch of photography has contributed to medical advancement and to the promotion of good health is a source of considerable satisfaction to the company.

In The Field Of Medicine StudioLightMagazine1923 87

PORTRAIT FILM NEGATIVE, VITAVA PRINT

By Francis J. Sipprell Buffalo, N. Y.