The term camera comes from camera, which in Latin means 'room' or 'camera'. The original camera obscura was a room whose only light source was a tiny hole in a wall. The light coming in through that hole she projected an image of the exterior on the opposite wall. Although the picture thus formed was inverted and blurred, the artists used this technique, long before film was invented, to sketch scenes projected by the camera. Over the centuries the camera obscura evolved and became a handy little box, and the hole was installed an optical lens to get a more clear and definite.
The light sensitivity of certain silver compounds, particularly nitrate and silver chloride was known before the British scientists Thomas Wedgwood and Humphry Davy began their experiments in the late eighteenth century for photographic images. Succeeded in producing images of paintings, silhouettes of leaves and human profiles using paper coated with silver chloride. These photographs were not permanent because after exposing to light, the entire surface of the blackened paper. (Continued)
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