T&L Publications

You sure the whole back panel doesn't come off? I have seen some calculators and similar devices where the batteries are sealed inside and screws have to be removed in order to change them. One place you might want to check is inside the tape compartment. I have a tape recorder where the battery doo...

The cf and df scales are c and d scales multiplied by a constant (usually pi). The scales are used to minimize the distance the slide must travel for a multiplication or division operation.

What type of slide rules do you have?