File:BillVanBrocklin Simplun 2 1956.jpg

Simplun by Bill Van Brocklin. The first stage in good boiler construction is the forms for the flanged sheets, such as tube sheets, front and back firebox heads and rear boiler head. Note drill guide holes in forms for front head and front firebox end. From The North American Live Steamer, Volume 1, Number 7, 1956.