user: Question: What's the Description for Scottish Tar Distillers No. 78, that's Livery is Black, and a date prior to 1897?
Columns: ['Number & name', 'Description', 'Current status', 'Livery', 'Date']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Scottish Tar Distillers No. 78', 'Rectangular Tanker', 'Static display in the museum.', 'Black', 1877.0]
SQL:

assistant: SELECT "Description" FROM "Table" WHERE "Livery" = 'Black' AND "Date" < 1897.0 AND "Number & name" = 'Scottish Tar Distillers No. 78';