War Patrol Report (Page 34)
| CONFIDENTIAL | |
| Subject: | U.S.S. BERGALL - Report of FIRST War Patrol |
| ------------------- | --------------------------------------------------------------------------------------------------------- |
| (O) | DENSITY LAYERS = |
| 1. 26-28 Oct. 1944: Westward approach to | |
| Balabao - no appreciable temperature
gradient in evidence down to 200 feet. No appreciable afternoon effect. |
|
| 2. 22 Oct. 1944: Entrance Gulf Siam | |
| (60°45'S.,
105°16' E.). No temperature
gradient or afternoon effect noticed. |
|
| 3. 28 Sept. -- 16 Oct.: Off Annam Coast (Cape | |
| Varella to Cape Padaran) two to
eight miles distance from the beach. General conditions discovered were as follows: |
|
| (a) No appreciable afternoon effect. | |
| (b)
Isothermal layer (less than 1° negative gradient per 100 feet) down to between 80 and 160 feet. |
|
| (c)
Immediately under (b) a steep negative gradient of from 3° to 10° and of a thickness between 25 to 45 feet. |
|
| (d)
From beneath (c) to 400 feet a gradient negative gradient of from 3° to 8° per 100 feet. |
|
| (e)
Greatest ballast differential (peri- scope depth to 400 feet) was 12,000 pounds. |
|
| (f)
See drawing on following page for sample bathythermograph card of the "evasive dive". This shows the typical conditions excepting that the pronounced gradient is usually more pronounced and the gradient from beneath the pronounced gradient to 400 feet is steeper (5° to 8° / 100 feet.) at distances 6 to 10 miles from beach. Evasive dive was made 4,500 yards from beach. |
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