Arizona republican., 1917-10-21
HOW ID OBTAIN 4 GOOD LIGHT A|uD
 ELIMINATE GLARE

The subject of lighting has g double interest for motor car owners in these days. Not only is the man who drives q car anxious to secure the best illum- ination for his path, but with so many lighting laws, state and municipal in force, it behoyes the motorist to be sure that he is on the right side of the law. We shall try to explain briefly how the car owner may obtain the best possible illumination and yet not break the law.
 In the first place the motorist should know that there are many lamps which will give q satisfactory illumination only with certain type and size of bulb. Every car owner should ascertain what special bulb will give the best results with his lamps and he should keep a reasonable stock of such bulbs on hand and in the car when on tour. BuIb cases may now be had that enable the carrying of these devices without dan ger of breakage, the former busaboo.
 The motoriSt should carefully eX- anime all bulbs purchased Often there Is an excess of solder on the base of the bulb and this prevents the proper contact of the bulb in the socket. When such a condition exists in bulb al- ready purchased, it may be remedied by filing off the excess solder or scrap ing it off with a knife
 When the motorist has obtained the correct bulb equipment, there still re mains the matter of adjustment before he is assured of satisfactory lighting. Unless the lamps are properly focused only faulty illumination will be ob- tained at best. The best way to focus the headlights is to drive the car with tn yxrith nf wall, barn door or some other flat perpendicular surface Adjust the lamps so tha@<he bulbs are as far back of the reflector as possible and then ob- serve the image made by the lights on the wall. In the center of each circle of light there should be a black spot. If this black spot does not appear, the adjusting device is limited in it's move ment to the rear If the black spot shows off dead center or if it is not exactly circular in form, it is sign that the filament is not in the axis of the reflector
 This trouble may be caused by the bulb not seating quite correctly in it's socket. Try giving it half turn be- fore returning it to the socket. If, however, the bulb has a tendency to spring away from correct position, the
 
 focusing device which will have to be remedied by the lamp maker or service station.
 Now We will presume that the black spot has been duly brought into the center of the image and the problem is to get rid of it. Adjust the bulb by moving it forward until the desired effect is obtained. Tn some socket ad- justing devices the movement toward the reflector is not so great as the movement away from it and the best image is obtained by moving the bulb out of the reflector as far as possible.
 The number of adjustment devices is large, some Of them attaining their ob- ject by moving the bulb, others by a screw at the back and others by nov ing the rim of the lamp, In manipu- lating lamps where the focus is ob- tained by moving the bulb, care must be taken not to loosen the bulb from its base during the operation.
 There is another type of defect that is sometimes encountered. This is where there is lost motion between the Of the reflector and the result is a dis places the source of light. that is to say. the center line of the filament does not coincide with the center line