Elevator Furnace is used by loading the parts to be heat treated onto a car platform, rolled into position, and then raised into the furnace. This type of furnace saves spaces in the plant and can be especially suitable for the metal alloys that have to be quenched rapidly, because a quenching tank can be placed directly under the furnace. An elevator furnace was constructed, which was to be used by the men to ascend from the bottom of the shaft, thus relieving them from the labor of ascending the stairs at a time when they were suffering from prostration of the vital energy caused by working in compressed air.