| Period | 24 hours position at normal temperature and 4 hours in each position at -20C |
| Position | Dial horizontal and vertical |
| Temperature | -20C and normal |
| Permissable errors | At normal temperature 60 seconds in 24 hours
At -20C - 30 seconds in 4 hours |
Source: National Archives of Australia File A705, 150/4/1831, Instument
Instruction 8-1 Vol II