Focus of Headlamps

New Zealand Herald, Volume LXXVI, Issue 23339, 6 May 1939, Page 12 (Supplement)

Focus of Headlamps

To focus a pair of headlamps properly, one needs to have the car on a flat, plane surface, dead at right angles to, and about thirty feet from, a truly vertical surface —preferably whitewashed. There should also be guide lines, on the Wall, and then the matter becomes comparatively simple. The headlamps should be left unopened as long as possible, since dust and damp are the mortal foes of the silvered reflector. When it does become necessary to remove dust from it, a perfectly clean, soft chamois leather', or -in emergency an old, soft silk .handkerchief, should alone be used. Sometimes, when the car has to be moved by hand, the headlamps offer a most inviting grip, and many who ought to know better can be seen to move the car by the lamps. This may cause the lamps to shift a fraction of an inch on their mountings, and next lime the lamps are used the beams will light the tops of the telegraph poles.