Notes on an Easy Method of Camera Lucida Drawing 239 
and out of the glass at right angles to the surface, double reflections 
are avoided and the reflecting apparatus becomes as efficient as a 
simple metallic mirror. 
The “ Pointolite ” outfit 1 is becoming so well known, and is, indeed, 
so rapidly becoming one of the recognised pieces of equipment for 
microscopic work, that description is unnecessary. Special stands and 
holders for the lamp are supplied, but in the present case the lamp¬ 
holder was attached to a heavy base with a universal ball and socket 
joint which happened to be available. For drawing purposes the 
lamp is arranged in the vertical position and covered with an oblong 
case of cardboard. This case (Fig. 1) has a small notch in the base, 
through which the flexible wire is passed, allowing the base of the 
case to rest flat upon the bench. In one side of this cardboard cover 
and exactly on a level with the small “pinhead/’ which forms the 
source of light, a round hole not more than three-eighths of an inch 
in diameter is cut. 
The substage mirror is removed from the microscope, or swung 
to one side, and the microscope is tilted into the horizontal position. 
The height of the tube in this particular case is slightly less than that 
1 The Standard ioo candle power lamp has been used (cost 24s.) with the 
Standard Universal Resistance Box and fittings (cost £5, less 33^ %), as supplied 
by the Edison Swan Electric Co., Ponders End, Middlesex. 
