60 On the Transit Instrument in determining Latitude. 
instrument; the run of which, as before stated, is only one 
: : : way. 
connection with the graduated circle, and is sufficiently sensitive 
* Sixty successive bisections of Polaris, near culmination, with the micrometer 
wire, gave for probable error of a single bisection, +0//-30; which would the 
probable error of a single result for latitude (involving two bisections) as depend- 
‘a 
ing on the micrometer alone, +0/"2 
