From the first time it produced drawings (the oldest on this site goes back to the 1870’s) until the late 1950’s, Vulcan produced all of its drawings using pen and ink, as described below (although I’ll bet that many weren’t drawn using the Rapidograph type pen shown below!) Many of these were drawn on linen. Above is an example of one, the general arrangement for the Vulcan 18C, from 1939. There are many more examples of these on the site.
More about Vulcan engineering is here.
via Hand drafting – TECHNICAL INK PENS — Construction and architecture
vulcanhammer.info 