Steel tubes containing water are heated by either gas, coal or coke, or by oil until the steam rises to a temperature of 500 F.
(Steel tubes; containing; water) (Steel tubes containing water; are heated; by either gas, coal or coke, or by oil; T:until the steam rises to a temperature of 500 F.) (the steam; rises; to a temperature of 500 F.)
Steel tubes Steel tubes containing water the steam
containing are heated rises
water
by either gas, coal or coke, or by oil T:until the steam rises to a temperature of 500 F.
to a temperature of 500 F.