[ 33 ° ] 
fuant to our engagements, beg leave to lay before 
you fome account of the communications received, 
with a fpecimen of the ufes and applications which 
we have been enabled to make of thofe, and other 
attiftances with which we have been indulged. 
On application to the Honourable the Commif- 
fioners of the Navy, we were obliged with an order 
of free accefs to all their matters log-books and 
journals. 
The Directors of the Honourable Eaft India 
Company granted the like privilege. 
The Honourable Committee of the Hudfon’s Bay 
Company obliged us with fundry obfervations, made, 
and tabulated, by their own Captains. 
James Bradley, D. D. Regius Profeffor of Attro- 
nomy, and F. R. S. favoured us with feveral obferva- 
tions made at the Royal Obfervatory at Greenwich. 
John Hyde, Efqj F.R.S. communicated a fett of 
ufeful obfervations, extracted from two journals kept 
on board the Triton and Britannia Eatt Indiamen. 
A correct journal kept on board the Delawar Eatt 
Indiaman was handed to us by a gentleman unknown. 
Capt. George Snow furniibed a confiderable num- 
ber of obfervations, made with care and accuracy 
by himfelf, in feveral fuccettive voyages to, and from 
Barbadoes and Virginia ; together with feveral re- 
marks upon the fubjedt : One y which we apprehend 
to be material, we beg leave to infert, as it meets 
with fome confirmation by the tables annexed ; viz. 
<c At Barbadoes the variation feems at a ttand very 
“ near; for in the road, 1 7 5-2 , I obferved f degrees 
<f eatt ; and by Mr. Halley’s draught, in the year 
“ 1701, 5 t degrees: in 1747, at Port Royal keys, 
“ Jamaica, I obferved the variation 7 0 20' E.; and 
“ on the coatt of Carthagena the fame week, off 
c - tl.e 
