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PHILOSOPHICAL 
TRA NS A CTIONS. 
I. Defcription of an Improvement in the Application of the Qua- 
drant of Altitude to a celejiial Globe , for the Reflation of 
Problems dependant on Azimuth and Altitude. By Mr. John 
Smeaton, F. R. S.; communicated by Mr. William Wales, 
F. R. S. 
Read November 20, 1 7 8 S. 
P ERHAPS there are few inftruments that better fulfil 
their defign in general, or more naturally reprefen t the 
movements they are intended to explain and illuftrate, than 
the terreftrial and celeftial globe, which are alio applied to 
relolve fome of the problems of the fphere, which they molf 
readily do. I believe, however, that whoever applies to 
Vol. LXXIX. B them 
3 - V y ~6i ^§r 
