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.
Cut a piece of the metal to make Figure 28-B. This piece is 41/2"x51/2". Measure 23/4" from three sides and make a light center-punch mark. Using this mark, first set the dividers for a 23/4" radius and scribe a half circle to the three edges that were used for this mark. Change the dividers to a 21/2" radius and scribe another half circle. On this 21/2" radius the marks for the tabs are laid out. The tabs on this back piece have to be spaced 21/8" centers to meet the slots in Figure 28-A. These slots were made 21/4" centers but due to the curvature after bending Figure 28-A they are brought closer together. Mark the top tab first and then measure from center to left and right. After the tabs have been laid out cut away the rest of the metal to the 21/2" radius and leave the tabs. Scribe a line 1/2" from the remaining straight edge which will be the bottom, and bend to right angle on this line. The piece Figure 28-A is now shaped to conform with the radius of Figure 28-B and the tabs are placed in the slots and bent over. These tabs will hold the two pieces firmly together.
Cut Figure 28-C next. A strip 1/2" wide and 5" long. Place this under the front of Figure 28-A and rivet to the 3/4" ends on the bottom. Now bend the pointed ends which were cut inside the vent hole of Figure 28-A so that they point downward. Make a wooden plug to close the vent hole. Push the plug down so it extends 1/2" below the top. This plug will act as a guide for the thickness of the lining.
The hood is now ready to receive the lining. If the stove lining is bought in a labeled package directions are usually given. A shallow pan is best for mixing although any flat surface will do. Keep about two tablespoonfuls of powder for filling any cracks that may appear when the clay is baking. Place the powder in the pan and add a little water. This is very important. Do not make the mistake of adding too much water. It is best to use a little and add more if needed. Mix the clay with the hands kneading it thoroughly to the consistency of stiff putty. When the clay is ready begin at the back of the hood and spread the clay with the fingers so that it will be about thick. Next, start the sides by filling the bends at the bottom on either side and working toward the top. When the whole surface is covered with of clay wet the fingers and smooth the surface. When the surface is smooth and even enough the clay will be ready for baking.