| 3h 25m 10s |
| - 1 10 05 |
| 2h 15m 05s |
Now suppose you took an observation which, according to your watch, was at 2h 10m 05s. What would be the corresponding C T? It would be
| WT | 2h 10m 05s |
| C-W | 2 15 05 |
| CT | 4h 25m 10s |
If the chronometer time is less than the W T add 12 hours to the C T, so that it will always be the larger and so that the amount to be added to W T will always be +. For instance, CT 1h 25m 45s, WT 4h 13m 25s, what is the C-W?
| CT | 13h 25m 45s |
| WT | 4 13 25 |
| ———————— | |
| C-W | 9h 12m 20s |
Now, suppose an observation was taken at 6h 13m 25s according to watch time. What would be the corresponding CT?
| WT | 6h 13m 25s |
| C-W | 9 12 20 |
| ———————— | |
| 15h 25m 45s | |
| - 12 | |
| ———————— | |
| CT | 3h 25m 45s |
Put in your Note-Book: CT = WT + C-W.
If, in finding C-W, C is less than W, add 12 hours to C, subtracting same after CT is secured.
| Example No. 1: | |
| CT | 3h 25m 10s |
| WT | 1 10 05 |
| ———————— | |
| C-W | 2h 15m 05s |
| WT | 2h 10m 05s |
| + C-W | 2 15 05 |
| ———————— | |
| CT | 4h 25m 10s |
| Example No. 2: | |
| CT | 1h 25m 45s |
| WT | 4h 13m 25s |
| (+12 hrs.) CT | 13h 25m 45s |
| WT | 4 13 25 |
| ———————— | |
| C-W | 9h 12m 20s |
| WT | 6h 13m 25s |
| + C-W | 9 12 20 |
| ———————— | |
| 15h 25m 45s | |
| (-12 hrs.) | 12 |
| ———————— | |
| CT | 3h 25m 45s |