( <5o3 ) 
III. ExtraSis from Mr. GafcoigneV and Mr. Crab- 
trie x Letters, proVing Mr. Gafcoignc to haye 
. been the Inventor of the Telefcopick Sights of 
Mathematical hiftruments^ and not the French. 
!By W. Deiham, Trehend of Windfor, and 
R* Soc. Soc. 
I N Monfieur de U Hire's firfl Part of his T alula A> 
(Iron, publifhed in 1687. I find an Invention, 
which was undoubtedly our Countryman Mr. Ga[~ 
coignes, afcribed to Monfieur Picard, and that is, the 
.application of Telefcopick Sights to Aflronomir.al Infiru» 
ments. Mr. de la Hires Words are, Paucis ahhinc an- 
nis D. Picard infignis Aflronomus, afcjue in eadem Acade- 
mia ^ Regia Scientiarurn\ Socius, Dioptrarum crenas ah in- 
firumentis fujlulit, eorumque loco fuhfiituit Telefcopia ; 
res Predytis Myopikus,8iC. In which Words it is not 
indeed exprefly (aid that Mr. Picard was the Inventor 
of this way, but only that he applied Telefcopes. But 
by reafon it implies that it was that curious and in- 
genious Gentleman Mr. Picards Invention, and it is in 
effecfl: claimed as luch, in Monfieur Auzout's Account 
of the Telefcopick Micrometer^ in the Philof Tranf. No. xi. 
therefore I think my felf in Duty bound, to do that 
young but ingenious Gentleman, Mr. Gafcoigne. the 
Juftice, to aflert his Invention to him ; by reafon all 
his Papers, that by the late ingenious Mr. Torvnelefs 
Diligence could be picked up, are now ^together with 
Mu Towneleys own Papers^ in my Hands. 
