BY H. n. HUTCHISON, L. K. GIBLIN, ik W. F. D. BUTLER. 3 



for this reason were more liable to inaccuracy at this point 

 than at either X or Y. 



On the following day Mr. Hutchison took the neces- 

 sary angles from the points X and Y, and also observar 

 ticns of several other points, including Mount Pelion, 

 lying approximately 9 miles to the S.S.L. 



The instrument used was a 5-inch Troughton and 

 Simms" trajisit theodolite, reading on each circle by two 

 veruiers to 20". 



Tests as to the accuracy of vhe measurements are 

 obtainable bv taking the thi'ee measured angles of the 

 ti-iaugl.? XY"Z, the sum ot wliicli was 180° U' 29", and 

 also by calculating the distance between the two points 

 B and Z from the data obtained from the two triangles 

 B X Z and B Y Z. This was 7,271.96 feet and 7,271.6U 

 feet respectively ; and similarly the distance C Z from the 

 two triangles C Z X and C Z Y was, respectively, 9.147.61 

 feet and 9,145.64 feet. 



The angles obtained at each setting are given below, 

 and an abstract given of the calculations, from which it 

 will be seen that the height of Barn Bluff was determined 

 i?i three ways from the points X, Y, and Z. the results 

 being based upon a height of 5.069 feet for Cradle Moun- 

 tain. 



Height of Barn Bluff. 

 Obsei-vation. Calculated Height. 



From X 5,114.86 



From Y 5,114.34 



From Z 5,114.43 



The results justify the adoption of 5,114 feet as the 

 height of Barn Bluff. 



The observations of Mount Pelion are int^reS'ting, 

 but, unfortunately, not conclusive owing, first, to the 

 smallness of the base X Y'^, compared with the distance 

 from P (Mount Pelion) ; and, secondlv, to the smallness 

 of the angle X Y^ P. However, it seems certain that this 

 mountain is over 5,000 feet in height, and probably in 

 the neighbourhood of Barn Bluff and Cradle Mountain, 

 but it does not appear likely that it will prove to eclipse 

 Leggo Tor on Ben Lomond. 



The latitude of Cradle Mountain is given on the offi- 

 ciiil maps as 41° 43'. 41° 44' 20" wa.s, therefore, adopted 

 as the approximate latitude of Z, and from the observations 

 taken there of the sun, the hearini!^ of the point B on Barn 

 Bluff from C on Cradle Mountain was Soutli 28° 12' 17" 

 Wes". The distance between the two points was also found 

 from the above observations to be 3 miles 7 chains 51 links. 



