Process of manufacture
54.—(1)  All steel intended for use in the construction of boilers shall be made by the open hearth process, acid or basic.
(2)  Where steel intended for boilers is not produced in the works at which it is rolled, a certificate shall be supplied to a surveyor of ships deputed to witness the testing of the material, stating the open hearth process by which it was made, the name of the steel maker who supplied it, also the numbers of the charges for reference to the books of the steel maker. The number of the charge shall be marked on each plate or bar for the purpose of identification.