Date: Wed, 30 Aug 2000 09:44:09 -0600

Author: Jerry DiMarco

Subject: Re: Correction to historical apparatus Fig. 3



Thanks for the additional info. Every little bit helps. If you have
time, it would help further to know more details about each, such as:
Fig.1 - connections to binding posts, function of top 2 thumbnuts,
connections to switch, clearance under ball on spring.
Fig.2 - which tubes are connected, function of metal strips attached to
left cylinder, insides of cylinders, path of wire through cylinders.
Fig.3 - shape of top nozzle (can't quite see all of it in the photo), type
of material supporting tubes, byproducts in tubes.

Currently the only guesses I have are that #2 is some kind of
calorimeter-based demo, and #3 is an ion recombination demo like 5D40.25,
or an apparatus for measuring vapor density. More info would definitely
help us to better understand the function of these items. Hopefully, you
are not too busy yet, I always like a good puzzle...


At 08:36 AM 8/30/00 +0200, you wrote:
>Dear apparatus archeologists,
>I took a closer look at device Fig. 3 and it turns out that the two
>vertical cylinder tubes are not quite identical. The upper one (the one
>with the ''coil'' (see below) to the electrical contact) is indeed just a
>thin walled tube but the lower one shows a concentric funnel like brass
>diaphragm in the middle, at the height of its own electrical contact post.
>The inner diameter of the funnel is only 3.5 mm and the funnels thin end
>points towards the bottom, hence the ''burner'' side. The lower inlet end
>shows some signs of flame traces, therefore it is quite possible that it
>was used as a burner as opposed to a water reservoir.
>The ''coil'' connected to the top cylinder is not a coil but more something
>like a capacitor. Both ends are electrically isolated and what appears like
>a coils is actually a pile of round concentric layers of paper and metal
>with always a metal layer between paper and vice versa.
>The two vertical main tubes are electrically isolated against the main
>stand but both have connection posts as shown in the picture.
>I am still very much puzzled by all three pieces of equippement.
>Thank you for the help
>Urs Lauterburg
>Physics Edutainer
>University of Bern