This section is from the book "Soldering For Workshop, Farm And Home", by John Bonert. Also available from Amazon: Soldering For Workshop, Farm And Home - Information On Soft And Hard Soldering - Projects For The Workshop Explained And Illustrated.
This hood is illustrated in Figure 28 and is to be used on the gas stove shown in Figure 27. The construction of this hood is not a difficult task. If directions are followed carefully it will compare favorably with any that can be purchased from the manufacturers of heating apparatus. The cost for materials is very small and it can be made in a few hours. A piece of iron either galvanized or black, 26 or 28 gauge, measuring 8"x 18", 21/2 pounds of stove lining and two small rivets are the materials needed. The writer used a 21/2 pound package of Rutland Stove Lining. Stove lining is fire clay in convenient powdered form. It is prepared by adding water. Any fire clay sold by hardware stores and used as stove lining will do a satisfactory job.
Figure 28-A is the first piece to be prepared. Cut the piece 8" x 12". On one 12" side which will be known as the back scribe a line1/4" from the edge and mark the five slots which are 21/4" on centers on this line. Mark the center slot first then measure to the right and left from center. When the slots are marked the following will be a good method for cutting them. Place the work on a piece of iron (do not use hardened steel for this), and with a cold chisel and hammer mark all five slots deep enough so they will bulge the metal on the opposite side about 1/32". Turn the sheet over and file the five bulged points until the slots appear. Then smooth out the rest of the bulge by tapping lightly with a hammer. The vent hole should be marked out next. The center to be 11/2" from the back edge as shown in the diagram. Scribe a one inch circle with a pair of dividers and mark four times across the center as shown. Cut through on these marks with a cold chisel but do not bend the points until after the hood has been shaped. Next, scribe two lines on each of the 8" edges, one of them 1/2" and the other 1" from the edge. From each corner on the 12" side measure and cut on these marks to the 1/2" line. The bending of the 8" sides can now be done. First, bend to a right angle on the 1" line. Then, by placing a piece of 1/2" board with a straight edge against the turned up side bend on the 1/2" line. This will leave the ends U shaped with the exception of the 3/4" end which will be used for fastening the cross piece 28-C.