CREATE TABLE table_75742 ("Name" TEXT, "Builder" TEXT, "Laid down" TEXT, "Launched" TEXT, "Completed" FLOAT)

What is the name of the boat that was built by Chatham and Laid down of 25 april 1887?
SELECT "Name" FROM table_75742 WHERE "Builder" = 'chatham' AND "Laid down" = '25 april 1887'
SELECT "Name" FROM "table_75742" WHERE "Builder" = 'chatham' AND "Laid down" = '25 april 1887'