212 
This table (4) may be fixed on the auxanometer by the upward 
movement of handle (5). There is an opening in the cover for the 
plant and on that cover three little mirrors have been fixed for 
i ¥ 
Ie 
or 
Fig. 1. The auxanometer. 
exposition to light. The plant is drawn up exactly under the centre 
of the contact-device (9). On the brass piece (8) a small plate of 
brass has been mounted, isolated by ebonite, at which has been 
soldered a thin platinum strip (9). On this platinum strip lies a 
minute piece of polished gold, just opposite to a screw (10) in the 
brass piece (8) in the end of which has been soldered a fine point 
of platinum. This apparatus has been carefully made. It is an im- 
perative condition that the platinum strip should yield very lightly 
to pressure and yet be elastic. If the screw (10) is at the minimum 
distance from the golden plate, without making contact, a weight 
of 2 mgr. on the platinum strip is sufficient (in inverse position) to 
