605 
The conduction of the film begins to be measurable at a thickness 
of 1.645 uu; a black deposit is then already clearly visible on the 
glass wall; its absorption could be estimated by the eye by comparison 
2 
ee 
Beene 
= 
: aa ey amen 
is ae 4 Beeline Ke Bn 
Fig. 2. 
to at least 10°/,. The rapid increase of the specific resistance begins 
with films of about 7 uu. The results were confirmed by two series 
of measurements with other platinum wires which agreed with the 
data of Table | to within a few percentages. 
