I would just like to know what the manuals say, and what the practice would be in that era with regard to patent logs when going through ice fields.
Your question is relevant but only in so far as it relates to ships that don't cross ice fields - we know on the 15th April The Californian went through the ice field 3 times.
Even going down the western side of the ice field, according to Groves, bits of ice were bumping against The Californian.
I think it's quite a simple question - would you use a patent log in such conditions?
Or only in ice field free water steaming along normally?
I have an old copy of Nicholl's Seamanship & Nautical Knowledge which spans the sail-steam-motor eras. It also covers measuring methods from the chip log to the electronic variety.
As far as use is concerned, it relies on common sense and good seamanship practice in that no practical seaman would drag anything behind his vessel - be it log line or fishing gear- through an area in which, he, the seaman , knew for certain that the tackle being used will be damaged or lost.
Does that answer your question?
No.So would it be wise to use in a icefield?