AT THE ROYAL OBSERVATORY, CAPE OF GOOD HOPE. 



483 



One revolution of micrometer = 26&quot;. 06925. 

 After tenth measure turned the position circle verniers 180 to eliminate the coincidence of the wires. 



One revolution of micrometer = 2fi&quot;. 06925. 

 After tenth measure reversed the position -Mrcle vernier*. 



