( ?42 ) 
Sifon, for taking the Diftance of any kind of Ob- 
jects. It is fupported by a (ingle Stem fkrewed on 
to it on the under Side, the lower End of which 
may reft on the Ground, to eafe the Obferver of the 
Weight of the Inftrument. This Stem is alfo 
made to lengthen or (horten, by which Means the 
Inftrument is brought to the proper Height for 
any Obferver’s Eye, either Handing or fitting. In- 
ftead of a Ball and Socket, it has two circular Arches 
fixed on its Back, by which it is readily fet to 
any Pofition which the Situation of the Objeds may 
require. 
The Right Honourable the Lords Coramiffioners of 
the Admiralty having been pleafed to order the 
Chatham-Tacht for the Trial of the faid Inftru- 
ment, and to give Directions to Mr. James T'oung, 
Mafter Attendant at Chatham , a Gentleman well 
ikill’d in Navigation, to be prefent at the Trial, my 
two Brothers and Self went on Board accordingly 
JVednefday , Augujt the 30th, being favoured with 
the Company (befides the two ’forementioned Gen- 
tlemen) of the Reverend Sir Robert Pye, Bart, and 
Robert Ord, Efq; Members of this Society. We 
met Mr, Toting at Sheernefs the next Day, who ac- 
companied us down about three Leagues below the 
Nore , near the Spile-Sand , and was on Board on 
Friday , September the ift, when we lay by there, 
and thefeveral Altitudes of the Sun were taken as it 
approached the Meridian from about Ten of the Clock 
’till Noon. 
The 
