How long have the 35 ml stainless steel (pewter?) measures been in use in Scotland? I know that pours used to be more toward the 25 ml size and they gradually moved upward to 35 ml but I'm more interested in when the transition to the more exact measures as opposed to freehand pours occurred. It's possible that there are locales in Scotland that do a free pour but every pub I've visited always pours into a 35ml measure and then transfers the whisky to the glass. Has it been this way for a long time or is this a recent development?
Ron

