5 Insulating Firebrick, 2300°f, 9 X 2 1/2 X 4 1/2
24 Round Head Sheet Metal Screws, #6 X 3/8
1 Piece. Asbestos Shingle or Sheet Asbestos, Approx. 2 X 6
2 Pieces. Flat Steel, 1/8 X 1/2 X 6
1 Pint High Temperature Furnace Cement
1 Heating Element, Nichrome, Coiled, 1000 Watts at 110 Volts
1 Piece. Round Steel, 1 1/4 X 18
4 Brass Machine Screws, Round Head, 10-24 X 3/4
8 Hex Nuts, Brass, 10-24
1 Piece. Round Metal Stock, Any Material, 1 1/2"x 4 (For the Counterweight)
1 Heavy Duty Line Cord (Type Used on Electric Irons)
4 Machine Screws, Round Head, 6-32 X 1 1/4
4 Hex Nuts, 6-32
1 Power Control, Type C.r.s., Rated 1000 Watts (Minimum)
1 Pyrometer
1 Can, Heat Resistant Lacquer or Enamel
You can begin construction by cutting the galvanized sheet, to the required dimensions given. We
should now lay out the individual pieces for further cutting, folding and bending. You will note from the
drawing details that I have shaded the areas that are to be removed. For neater looking corners, we
have drilled 3-inch holes on centers at the intersections of the areas to be removed. These holes permit
much easier bending and allow for the slight miss cutting of angles. Look at the metal layout details for
dimensions and areas to be removed.
All pieces must be bent to 90° as shown by an "x" on the metal layout detail sketch. If you have a sheet
metal shop in your town, it is better that we take it to the shop and let them do the bending. If there is not
a sheet metal shop in your town, clamping the pieces in a vise we can do the bending between two