OF OPTICAL INSTKUMENTS. 



131 



FIG. 1574. 



1568. POETABLE MAHOGANY DBAWING BOAED AND TEIPOD STAND, occasionally used 



with the camera lucida . . . 150 and 1 15 



1569. CAMERA OBSCUEA, for making sketches and portraits from nature, best make, for 



pictures, 7x56%. 1569) . . 10 6 and 15 



1570. Portable Field Camera, for sketching from nature direct upon the drawing 



paper . . . . . 3 to 5 10 



Photographic cameras, etc., see photographic apparatus, pages 138 to 141. 



1572. Claude Lorraine or Convex Black Glass Mirrors, in morocco cases, much used 



to facilitate the delineation of landscapes in perspective (fig. 1572), 5^ hy 6, 

 15s. 6d. ; 5* by 74, 1 ; 6 J by 8f , 1 7 6d. ; 74 by 94 . 1 15 



1573. COLOUEED GLASSES OE CLAUDE LOEEAINE TINTS, to illustrate the effect of 



colours on pictures, in horn or tortoise-shell case, 3s. 6d. to . 12 6 



1574. Optical Diagonal Mirror, for viewing prints in perspective, and increasing their 



size to an extent almost approaching to nature, on richly turned mahogany 

 pedestal (fig. 1574) 220 



1575. INTEEESTING COLOURED PEINTS, for the above, consisting of views of the chief 



cities in Europe, showing their principal forts, public buildings, etc., per 

 dozen . . . . . . 15 



1576. Dental Mirror (concave), for magnifying and examining at pleasure the inner 



surface of the teeth, in folding silver frame, for the pocket 16 6 



1577. OPTHALMOSCOPE, of much importance, for viewing the interior and back surface 



of the eye 15s. 6d. to 150 



K 2 



