Hinacava Mounrains. QAT 
laid on five timbers planed exceedingly irue, and supported each on two 
stands. ‘Shey were then adjusted by the wires of both the rods. The ends 
of the apparatus were towards. each other, and to be sure that these corres- 
ponded aT’, square was applied to the cheek of one rod, and the languette 
of the other pushed out to meet it. 
The Norius read off was,:....c.0.. 380 
Reversed it was,....... : 3°93 
Inches 
Vesa oes. eer 's Bak: 3°385 349 
Hqnationof fod,*... ake e esa. 004 
By this quantity the rod 1.2, was in advance of 2.3. Now an arc of 
43 mches radius, described from a point in 2.3, short 0088 of the mark defining 
300:9507 inches, cut 1.2at the division 14-405; adding the quantity above 
given, 345 inches—1°380 divisions, we get 15°785, which is the point where 
the arc would have cut, had the other ends of the rods been. placed even. 
Now let e d be the line in which the centre of the arc faewas found: 
Let e g be the line of divisions or 1.2, anda the point which formed the 
lirait of 300°942 inches. 
ae measured, 42 inches. 
Andc d ditto, ! 92°04 
3 , aw 
A a —— 
* Tur cheeks of the yods were not quite parallel to their axis; the error was found, and this is the 
correction due to it. 
vou. XIV. SOR 
