5 1 6 Sir george shuckburgh’s Obfervatioas 
leagues fouth of Geneva, and precifely on the fame point 
where Mr. de luc had made his higheft or fifteenth fta- 
tion : this fpot I learnt from his brother, whofe civilities, 
both then and fince, I fhall frequently have occafion to 
remember and mention. 
The place where I meafured my bafe was in a field 
near the villages of Archamp and Neidens, not quite 
three miles in a horizontal line from the top of the rock 
whofe height was to be determined (lee the chart that 
accompanies this account). At the end of the bafe a 
I intended to place one of my barometers; and the other 
at the top of the rock, called the Pitton, at c ; and with 
the above inftruments meafure the triangle abc. The 
angles were taken both on the horary circle, which was 
brought parallel to the horizon, and alfo on the azimuth 
circle of the equatorial inftrument; this made it, as it 
were, two different inftruments independant of each 
other. The angles were moreover doubled, tripled, and 
quadrupled, on each arch; by this means the error of 
the center or axis of the inftrument vaniflied ; the poffi- 
ble error in the divifions, in the reading off, and in the 
coincidence of the wires in the telefcope (which magni~ 
filed forty times) with the fignals placed at each angle of 
the triangle, wasdeflened in proportion to the number 
of times the obfervation was repeated; and finally the 
mean 
