Mn Valley Man has it right. Switching from one filament to the other puts the hot spot in a different position in relation to the reflector, thus changing the angle of the beam. To demonstrate this, shine a flashlight at a mirror, first straight on, then at an angle. Watch how the beam moves. Or even look at a mirror, same result. Your truck should have a manual throttle knob. Pull it just a tad to kick up the idle speed & keep voltage up. I remember my dad's 39 Chev car, had the bulb style lights too. Somewhere he got a kit to convert to sealed beams, really made a difference. Maybe some outfit such as J C Whitney still sells such a kit.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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