Marie Curie - Mobile Military Hospital X-Ray-Unit, c. 1915.
Marie Curie is seated in a vehicle that serves as a mobile X-ray unit (radiological car) during WWI.
The mobile unit resembles a large motor truck or van converted to carry X-ray equipment. It has an enclosed rear section, likely to shelter equipment and provide some workspace. The front cabin is open; Curie is seated behind the wheel, suggesting she may have been driving or positioned there for the photo.
She wears a dark coat or wrap and sits formally in the driver's position. Her attire is practical rather than ornate. She has a serious but composed expression.
https://en.wikipedia.org/wiki/Marie_Curie#/media/File:Marie_Curie_-_Mobile_X-Ray-Unit.jpg