I recently came across a small publication from 1933 titled the 'Bradley handbook of Diving.' This was part of Bradley's campaign to further the interest and ability in Diving. The use of their slogan "Slip into a Bradley and out of doors" is included and was used extensively in their advertising campaigns.
I encourage you to read through this by enlarging the images by clicking on them. If you have an interest at all in diving you just may learn a thing or two from the past. I really enjoy the illustrations included. They just don't make them like this anymore.