Clarence Madison Dally (1865– October 2, 1904) was an American glassblower, noted as an assistant to

Thomas Edison Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventi ...

in his work on

X-ray An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30&nb ...

s and as an early victim of radiation dermatitis and its complications.

Early life and education

Clarence Dally was born in Woodbridge,

New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delawa ...

, one of four brothers. He enlisted in the

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

at the age of seventeen, and served for six years.

Glassblowing

After obtaining an

honorable discharge A military discharge is given when a member of the armed forces is released from their obligation to serve. Each country's military has different types of discharge. They are generally based on whether the persons completed their training and the ...

he went to work at the Edison Lamp Works in

Harrison Harrison may refer to: People * Harrison (name) * Harrison family of Virginia, United States Places In Australia: * Harrison, Australian Capital Territory, suburb in the Canberra district of Gungahlin In Canada: * Inukjuak, Quebec, or " ...

with his father and brothers as a glassblower. Around 1890 he moved to the Edison Laboratory in West Orange to assist in experiments with the

incandescent lamp An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxida ...

Working with Edison

Dally was a favored employee of Thomas Edison. He was entrusted to help demonstrate Edison's new fluoroscopic machine at the 1896 National Electric Light Association exhibition.

Edison X-ray focus tube

Following Röntgen's work on X-rays in 1895, Clarence and his brother Charles worked on the development of the Edison X-ray focus tube, developing the

fluoroscope Fluoroscopy () is an imaging technique that uses X-rays to obtain real-time moving images of the interior of an object. In its primary application of medical imaging Medical imaging is the technique and process of imaging the interior of a ...

using

calcium tungstate Scheelite is a calcium tungstate mineral with the chemical formula Ca W O4. It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist K. Scheele (1742-1786). Well-formed crystals are sought by collectors ...

. The Edison fluoroscope produced sharper images than the Röntgen fluoroscope, which used barium platinocyanide. At the time, the levels of X-rays produced were not believed to be dangerous. However, Edison noted how "the x-ray had affected poisonously my assistant, Mr. Dally."

Radiation effects

By 1900, Clarence Dally was suffering radiation damage to his hands and face sufficient to require time off work. Due to him being right handed, he used his left to test the beam from the machine. This caused his left hand to be affected before his right. In 1902, one

lesion A lesion is any damage or abnormal change in the tissue of an organism, usually caused by disease or trauma. ''Lesion'' is derived from the Latin "injury". Lesions may occur in plants as well as animals. Types There is no designated classif ...

on his left wrist was treated unsuccessfully with multiple

skin graft Skin grafting, a type of graft surgery, involves the transplantation of skin. The transplanted tissue is called a skin graft. Surgeons may use skin grafting to treat: * extensive wounding or trauma * burns * areas of extensive skin loss du ...

s and eventually his left hand was

amputated Amputation is the removal of a limb by trauma, medical illness, or surgery. As a surgical measure, it is used to control pain or a disease process in the affected limb, such as malignancy or gangrene. In some cases, it is carried out on indiv ...

. An

ulceration An ulcer is a discontinuity or break in a bodily membrane that impedes normal function of the affected organ. According to Robbins's pathology, "ulcer is the breach of the continuity of skin, epithelium or mucous membrane caused by sloughing o ...

on his right hand necessitated the amputation of four fingers. These procedures failed to halt the progression of his

carcinoma Carcinoma is a malignancy that develops from epithelial cells. Specifically, a carcinoma is a cancer that begins in a tissue that lines the inner or outer surfaces of the body, and that arises from cells originating in the endodermal, mesoderm ...

, and despite the amputation of his arms at the elbow and shoulder, he died from

mediastinal The mediastinum (from ) is the central compartment of the thoracic cavity. Surrounded by loose connective tissue, it is an undelineated region that contains a group of structures within the thorax, namely the heart and its vessels, the esopha ...

cancer Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal b ...

. Dally is thought to be the first American to die from the effects of experimentation with radiation. Following this, Thomas Edison abandoned his research on X-rays. In 1903, Edison said "Don't talk to me about X-rays; I am afraid of them."Duke University Rare Book, Manuscript, and Special Collections Library: "Edison Fears the Hidden Perils of the X-Rays", ''

New York World The ''New York World'' was a newspaper published in New York City from 1860 until 1931. The paper played a major role in the history of American newspapers. It was a leading national voice of the Democratic Party. From 1883 to 1911 under pub ...

'', August 3, 1903, Durham, NC.

Personal life

Dally was survived by his wife and two sons.

Early life and education

Glassblowing

Working with Edison

Edison X-ray focus tube

Radiation effects

Personal life

See also

References

Further reading