( <5o5 ) 
Crahtrie how he had applied his Telefcopick Sights to 
a Sextant. Saith he, Mr. Horrox hh Theory of the Moon 
J (hall be fhortly furntihed to try. for I am fitting my Sex^ 
tant for all manner of Obfervations, by trro Perfpicills mth 
Threads. And alfo I am confulting my Workman about 
the making of Wheels like (i. of f Diagr. 3, to uje 
trro Glajfes like a Seilor. If I once have my Tools in rea- 
dinefs to my Defire,! fhallufe them every Night. I have fitted 
my Sextant by the Help of the Cane, two Glaffes in it, and a 
Thread, fo as to be a pleafant Infirument, could Wood and 
a Country-Joiner or Workman pleafe me. 
In another Letter (the Dare of which is worn our, 
but is, in Mr. Crabtrus Hand, called his icth Letter 
to him) he faith, I have given order for an Iron filua- 
drant of Five Foot, which will give me the 1000th Part 
of One Degree, which (hall be furnifhed like my fir ft Scale ; 
only my Workman is fo * throng for my Father, that / fear 
it will not he finifhed before the Eclipfe. I have caufed 
a very firong Huler to be exalily made, and intend to fit it 
with Curfors of Iron, with Glajfes in them and a Thread, 
for my Sextant. 
To thefe I could have added many other PafTages 
•of the like Nature: but thefe may be fufficienr,to fliew 
that Mr. Gafeoigne, as early as 1640, made ufe of Te- 
lefcopes cn Quadrants and Sextants, as well as in his 
Invention of the Micrometer. 
What Commendations thefe Contrivances got him, 
and what Expedations they railed in fome of the A- 
flronomers of that Time, particularly in two of the mofi: 
acute of that Age, Mr. Horrox, and Mr. Crabtrie, may 
be feen in the fame Mr. Crahtrie s Letters to Mr. Gaf 
coigne, which are alfo in my Hands. Some PafTages of 
which I (hall recite, and at the fame time give the Society 
a Tafte of what thofe curious Letters do contain. 
This Diagram is wanting in the Letter. * A Tor.kjhire Fhrafe 
for fully employed. 
A a a a a 
!n 
