Twice I needed my SANS & STREIFFE slide rule in the field.

When the batteries are dead or I am outside the temperature range of my "CITY TOY", I am glad to have a good quality bamboo slide rule.

It was 118F on the Baha. My batteries were fried. I had to see how bad I was getting ripped off by a Mexican kid selling gas out of a barrel. He wanted to get paid in dollars for the gas he had priced in pesos/liter. I wanted gallons.

On another trip, I had a bull elk at 850 yards down hill at 40 degrees. The temperature was pushing -20 degrees. My HP27 screen went blank. The slide rule gave me the cosine of 40 degrees for the horizontal correction.