Light, Artificial Line Drawings, To Copy
exhaustiveness could be secured, the reader is referred to special treatises - the work of Mr. Lewis Wright on " Light" (Macmillan) being specially suited to the general reader. The photographic effects of certain radiations which do not affect the eye are described under Radiography.
Light, Artificial, for Photographic Purposes. See Flash Light, Portraiture, and Artificial Light.
Light-Fog. See Fog.
Lime, Chloride of (Ger., Chlorkalk; Fr., Chlornre de chaux; Ital., Cloruro di calce). Synonyms : Chlorinated Lime, Bleaching Lime, Bleaching Powder, Hypochlorite of Lime. See Bleaching Powder.
Lime Light. See Oxyhydrogen Light.
Lime Water. This is a solution of hydrate of lime made by agitating slaked lime Ca(HO)2 with water. It is feebly alkaline, and contains onlygrain of lime (CaO) to the ounce of water. By heating, this quantity is still further reduced. A more power-ful preparation, actually about fourteen times stronger, may be made by triturating one part of lime with twice its weight of pure sugar, manna, or glycerine; then adding 20 parts of water and decanting the clear solution. Lime water has been suggested as an accelerator for quinol development; but it is unsuitable, the action being very slow. It is also added to some toning baths to neutralise acidity.
Line. As a measure is equal toof an inch. Lens dia-meters are sometimes expressed in lines.
Line Drawings, To Copy. This is a subject about which many difficulties seem to hang, although actually there is no necessity for the same. It is generally desirable to use a slow plate, such as the commercial lantern plates and the photo-mechanical plates. The following directions will, it is hoped, make this an easy operation for any one. Having decided upon the size that the resulting negative shall be, the next question is to determine the focus of the lens to be used. If only one lens is possessed, then the size of the image is ruled by this, and the extension of the camera. Supposing we desire to reduce a plan or line drawing from the lineal reduction