[rollei_list] Re: [rolleiusers] 4x5
- From: John Jensen <jwjensen356@xxxxxxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 4 Jan 2015 20:52:43 -0800
Schott (OT)
________________________________
When we got our new induction stove-top range (Thermador, old U.S. brand, but
now part of BSH) I looked into the glass manufacturer. This unit is a Bosch
unit, made at a Bosch facility in Spain. The top is called Ceran, a Schott
product , and is a so-called space age product, based on high temperature
ceramics used in the space program. I believe there is a Zeiss corporative
connection (someone will have to verify this). It is my understanding that
this 'new' technology derived from the breakthrough at Corning in the 50s that
resulted in the Corningware line of kitchen ware. Pyrex proceeded Corningware
but this was something different.
We've had it for 5 years, works well. Five elements, two regular IR, three
induction. When the IR elements are on, yes, they get very hot, extremely hot
to the touch on the glass surface. But the induction 'elements' cool down very
quickly after they do their job.
I get a kick out of the connection with the stove top and the Zeiss lenses and
the B-W filters.
John
From: Don Williams <dwilli10@xxxxxxx>
To: rollei_list@xxxxxxxxxxxxx
Sent: Sunday, January 4, 2015 5:50 PM
Subject: [rollei_list] Re: [rolleiusers] 4x5
At 01:30 AM 1/4/2015, you Richard wrote, in part:
This was partially
because of the break up of the monopoly the Germans had on optical glass
before WW-1. While some optical glass was made in France and England most
of it, especially the Barium types, came from the Schott works in Dresden
which was controlled by Zeiss.
I own something that uses Schott glass. My range cooktop. No
idea how it would stand up to a serious thermal shock but it surely was
tested with a boil over before the design was released.
No idea of it's index of refraction or dispersion. It does seem to
be transparent to red and IR because it doesn't get very hot unless there
is a pan sitting over the heating coils. I'm pretty sure Zeiss had
nothing to do with the stove.
Happy New Year-
DAW
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