These Measures I took by letting the Shadow of the Hair, at half a Foot
distance, fall so obliquely on the Scale, as to appear twelve times
broader than when it fell perpendicularly on it at the same distance,
and setting down in this Table the twelfth part of the Measures I then
took.

_Obs._ 4. When the Shadow and Fringes were cast obliquely upon a smooth
white Body, and that Body was removed farther and farther from the Hair,