How to jumpstart 6V?

[daveboy]

I took Daisy (my mostly restored '52 1/2 ton) for about a twenty mile ride today. I've only had her for about a month and today was the first time I drove her in the rain. What were they thinking with vacuum-operated wipers anyway? I did discover a few leaks around the windishield/cowl area, and I will address that later. I had to turn on my headlights and yep...wouldn't you know it? I forgot to turn them off when I got home. As luck would have it, I realized my mistake before it was too late and Daisy fired right up. But, that started me thinking...can you jumpstart one of these 6V trucks SAFELY with a 12V battery? I know it is not designed for such, and can't be good for it to do it much. But, in case of emergency, can a friend with a modern 12V vehicle give me a jump without causing damage?

daveboy