This invention is epochal. It was the first of those photomechanical techniques that were soon to revolutionize the graphic arts by eliminating the hand of man in the reproduction of pictures of all kinds. It is the most important of Niepce's contributions, for it involved a principle that became basic to future techniques: the differential hardening by light of a ground that would control the etching in exact counterpart of the image.
Other metal techniques include the hammering into shape of metal (especially wrought iron) which has been softened by heating; and an additive process of constructing a work of sculpture with blobs of molten metal using welding equipment and materials. Both of these techniques are most used for small works since the products are apt to be solid and therefore very heavy for their size.
Research associated with defense and Security also has contributed; the goal of detecting remote nuclear explosions has required the development of new seismic techniques, techniques that are equally applicable to study of the earth's interior, earthquakes, and volcanic eruptions.
Combined with the recent surge in computer technology and the development of lasers, the availability of these satellite and seismic data has led to a far more comprehensive view of the earth, its atmosphere, and its oceans.
This invention is epochal. It was the first of those photomechanical techniques that were soon to revolutionize the graphic arts by eliminating the hand of man in the reproduction of pictures of all kinds. It is the most important of Niepce's contributions, for it involved a principle that became basic to future techniques: the differential hardening by light of a ground that would control the etching in exact counterpart of the image.