How to pronounce “thach” in English

would have them like in their top pocket. But actually for hundreds of years there are sort of beautiful ones were made and every industry, every trade had their own type ofslide rule. And when I was sitting at this guy's house these collections they were gorgeous. This one is from the 1890's which the log scales, you pull them out, and that called Thacher'sCalculating Instrument. This one here was the most amazing. Also in the 1890's, it's called Professor Fuller's