What Do the Rules of Banking and Credit Mean?

In 1975, any credit card purchase under the value of 50 pounds was a simple matter of signature and a roller machine. There was no swiping and instant computer connection. I took some self justifying comfort in the thought that as soon as the loss of the card was reported, Mr. Brooks account would not be debited. Only that of the Diner Club Inc. But what does that mean? Which is an excellent question to my mind. What do any of the rules of banking and credit mean? No, really. And those rollers. Oh my gosh. Yeah, I totally remember those."