I think you are right. Red bellows were supposed to suggest a
deluxe bellows made of "Russia" leather, cured so as to resist insects
and moisture. Real red Russia leather is a sort of brick color so the
bright red bellows one sometimes sees (as on Burke and James camera) is
probably just red dye.
On 7/17/2017 6:54 PM, Richard Lahrson wrote:
Richard,
Right, the bellows on the 2-D are replacement and black
color, I think the original 20-D bellows were red.
Rich
On Mon, Jul 17, 2017 at 2:01 PM, `Richard Knoppow <dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>> wrote:
I actually did learn this technique but its clumsy for a
practical method.
Re snakes and adders: there is a horrible pun here somewhere
which my punster brain can't quite get. This will plague me for
some hours.
On 7/17/2017 1:37 PM, Helge Nareid wrote:
On 17/07/2017 21:09, `Richard Knoppow wrote:
I am mildly a slide rule collector and still have the one ITo get _really_ pedantic, you _can_ add or subtract on a slide
got when in junior highschool. It is the type called a
"Mannheim", relatively simple. The others are more modern
multiple scale type.
Actually you can not add or subtract on a slide rule. You can
multiply and divide and make conversions, such as to log or
trigonometric functions, depending on the scales supplied.
rule, but only on a logarithmic scale (after all, that's how you
multiply or divide). The range is limited, and you would do
better using two linear rulers.
I'll take this as an excuse for an old engineers' joke:
After the flood, Noah let all the animals loose quoting the
Lord's command of "Go forth and multiply". Feeling happy with the
feeling of a difficult task accomplished he returned to the Ark,
and was surprised by finding a pair of snakes crying their eyes
out. He asked what the problem was, and they answered:
"We're adders - we can't multiply!"
Noah was a smart guy, however, so he chopped down a nearby tree,
split the trunk in half and made a table from it. He fetched the
adders, put them on the table, and told them:
"Even adders can multiply using a log table!"
- The Horrible Helge
-- Richard Knoppow
dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>
WB6KBL
