The rollers in modern wringers are made of a composition of rubber. They are adjusted so that they may be brought close together or moved apart. When wringing thin articles, the rollers should be set close together, and when wringing heavy articles, they should be set far apart. This adjustment of the wringer helps to do better work and save wear and tear on clothing and wringer. =170. Care of Wringers.= The bearings should be kept oiled, but oil must be kept off the rollers, as it rots them. Keep the rollers washed clean. Soap and water will remove the dirt which collects on them. If this does not clean them, wipe the rollers in a weak solution of ammonia. If the rollers get badly stained, wipe them with a cloth dipped in kerosene. Wash this off immediately, as kerosene dissolves the rubber as well as the dirt. Never leave a wringer with the pressure on the rollers when not in use. The pressure is either adjusted by thumb-screws or by a clamp. Loosen these when thru with the wringer. =171. Centrifugal Wringer, or Dryer.= The centrifugal wringer, or dryer, consists of a tub, inside of which is a smaller tub with perforated sides. There is a drain at the bottom of the outside tub. The wringer is attached to a device for making the inside tub turn rapidly. The power used is either hand or machine (Fig. 92). [Illustration: FIG. 92. Washer and dryer.] The rapid turning of the inner tub for three minutes throws the clothing and water in them to the outside of the revolving center. This tub being perforated, lets the water thru while retaining the clothing. Thus, the clothes are wrung as dry as in a wringer of the roller type. If the machine is turned a longer time, the clothes can be wrung entirely dry. =172. Care of the Machine.= When loading centrifugal wringers, put the heavy pieces at the bottom of the basket. Put articles in basket in bunches, and pack fairly tight. Do not have loose ends hanging out. Fold sleeves into garments. Load the basket full if there are clothes enough. A cover helps to hold the clothes in place. Load so that it runs even and does not wobble. Never hold your hand on the extractor after it has started. =173. Combination Washer and Wringer.= The centrifugal washer and wringer combined is built so that the basket can be lowered into a tub of water. The clothes rotating in water are washed. After this is accomplished, the cylinder is raised, and, when rotated, serves as a wringer of the centrifugal type. Load the washer with fewer clothes than for wringing. Roll each garment into a bunch before putting it into the washer. Centrifugal wringers are used also as dry-cleaning machines. For this use, they should be operated out of doors and at a slower speed than when water is used. Friction heats gasoline, causing it to evaporate rapidly. The friction between clothing, tub and gasoline when turned at a high speed may produce a spark which will ignite the gasoline. CHAPTER XXV MANGLES AND IRONS