An improvement in the mariner's and surveyor's compass needle; whereby the magnetic and electric fluids are so disposed as to prevent local attractions also, the derangement of the needle, by the firing of cannon and other violent concussions, may be immediately corrected with very little inconvenience, or delay, &c
Summary
Also available in digital form.
Tags
Date
01/01/1834
Source
Library of Congress
Copyright info
Public Domain