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- Description:
- Black and white photographic print depicting equipment in the product testing laboratory at the Champion Spark Plug Co. Caption on verso reads, "Product Testing Laboratory. From left to right are shown an impact testing machine from completely assembled spark plugs, an intermittent heat shock testing device, a modified Olsen tensile strength machine, the electric furnace and recorders for determining the temperature-electrical resistivity curve for assembled spark plugs, and a falling-weight impact tester for cores."
- Date Issued:
- 1922-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting the preheat end a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated May 25th 1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print depicting the inside of the Dressler Kiln at the Champion Spark Plug Co. Caption on verso reads: Taken by the Carborundum Company 9-20-1921 - Showing interior of Dressler Kiln (The kiln had been in service for seven months - 2-4-1921 to 9-7-1921). This is a detail of the damper box walls shown in photograph #43501. They are under quite a lot more heat at the right hand side than at the left. Probably a difference of three or four cones, those on the right hand, however, being constantly at a temperature which would melt cone 18 on the passing cars; also being under a slightly reducing temperature, while the brick at the left hand are only exposed a greater part of the time to pure air, particularly on the upper left hand corner.
- Date Issued:
- 1921-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated Nov-18-1921
- Date Issued:
- 1921-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. In the background are workers. Dated 4-18-1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting the cooling end of a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated 3-28-1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print depicting the inside of the Dressler Kiln at the Champion Spark Plug Co. Caption on verso reads: Taken by the Carborundum Company 9-20-1921 - Showing interior of Dressler Kiln (The kiln had been in service for seven months - 2-4-1921 to 9-7-1921). Looking down the carbofrax B muffles in the same direction as the gases pass. This shows the amount of silica on the surface: also the condition of the joints. Unfortunately the picture is out of focus and does not show the joints as well as it should. However, they are very much better than they were in the case of the previous failure. The mortar used in these joints is a mixture of 80% carborundum 14 and finer, 20% clay, and in no case has attached the carborundum chambers. Previously a mixture of clay and alumina was used and altho the mortar was not attached the carborundum had been eaten away on both sides permitting leaks. These chambers were in the kiln not only during this burning but during the previous burning as well, this is, altogether about fourteen operating months.
- Date Issued:
- 1921-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print depicting women performing final decorating in Dept. 8 at the Champion Spark Plug Co.
- Date Issued:
- 1922-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting the cooling end of a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated 6-7-1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Description:
- Black and white photographic print mounted on fabric depicting equipment in the Electrical Laboratory at the Champion Spark Plug Co.
- Date Issued:
- 1922-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
