deviation of the Needle.
      A Walkers Meridional Compaƒs may
be furnished from this Dockyard.
      A Dipping Needle must either be bought
of M^r Troughton Fleet Street; or furnished
by the Secretary of the Board of Longitude
at the requisition of the Lords Commiƒsioners
of the Admiralty, adjusted first for use
by M^r Troughton.
      An apparatus for observing the
diurnal deviation of the Needle may
be got from M^r Troughton.
      I have &c
          James Inman
          Profeƒser [sic] R N College