A Manual Of Photography

PORTRAITURE BY THE DAGUERREOTYPE. 105 the camera so arranged as to make an angle with Ike meld rays of less than ten degrees, so that all the spacedme»th.the eyebrows shall he illuminated, and a slight shadow east trom the nose. This involves, obviously, the use of reLecting mnrors to direct the ray. A single mirror would answer , and would economise time, but in practice it is often c°nv®7“‘^ two - one nlaeed, with a suitable mechanism, to direct the rays to vertices, and the second above it, to direct them m an invariable course towards the sitter. - On a bright day, and with a sensitive plate, lorads can h obtained in the course of five or seven minutes in th diffused day-light. The advantages, however, which might be suppom to accrue from the features being more composed and of a natural aspect, are more than counterbalanced by tli.e totoculty of retaining them so long in one cons an the effulgence But ill the reflected sunshine, the eye cannot bear the effulgence of the rays. It is therefore absolutely accessary to pass t^ no more than was necessary. It is not 1 ,. e-lass is emoloved to make use of a large surface, for it camera operation be carried on until the proof ^^toes, no traces can be seen in the portrait of its edges and ^boun daries; but if the process is stopped at an earlier intoh there will be commonly found a stam corresponding to the ^Lhe^ chair in "which the sitter is placed has a^aff at its back, terminating in an iron ring, that suppor stature arranged as to have motion in directions o। and any attitude. . By simply res nig the tag head against this ring, it may be kept sutheieny RMMMM tili back, which, if they are held motionless, are copied with Sy been stated, that certain pictorial advantages attend m arrangement in which the light is thrown upon the face at asm^ angle. This also allows us to get rid entirety of the shadow from the background, or to compose it more grace-