Number:
1813
Author:
Issue:
ET Vol 18, Oct 1865
Tags:
Optics
Solved by:
J. Dale, MQ Vol 5
Solved by:
J.L. Kitchin, MQ Vol 5
Solved by:
H.J. Purkiss, MQ Vol 5
Solved by:
H.M. Taylor, MQ Vol 5