Re: tesla's colorado lab

["Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:
> 
> Original poster: "Gomez ADDams" <gomez-at-netherworld-dot-com>
> 
> on that fateful day 8/10/00 12:12 PM, Tesla list uttered:
> 
> > Original poster: "acmnovak" <acmnovak-at-email.msn-dot-com>
> >
> > Hello All,
> > Today I uploaded a picture to my xoom-dot-com account that might interest you.
> > Sorry but I don't have a webpage or anything to go with it... Maybe
someday.
> > Anyhow, here it is:
> > <http://members.xoom-dot-com/mpn54601/csnlab.jpg>http://members.xoom-dot-com/mpn546
> > 01/csnlab.jpg
> > It is from a book called "The Fantastic Inventions Of Nikola Tesla". the
> > picture shows a small part of the colorado springs facility.
> 
>  This picture (the top one on your Xoom page) was originally taken as part
> of Tesla's notes, and appears in "Colorado Springs Notes 1899-1900"
> published by Nolit, Beograd, Yugoslavia, 1978.
> 
>  The caption in my copy reads, "Phot. V.  View of interior showing a number
> of coils differently attuned and responding to vibration transmitted to them
> from an electrical oscillator".
> 
>  Note that the large coil in the right of the photo is his 'extra' coil.
> 
>  The descriptive notes which accompany this photo are very interesting,
> especially the part where he suggests something that could have led to color
> photography!  They read:
> 
> "View of interior much the same as in (photo -bill) II.  The secondary and
> various coils placed inside, particularly the central "extra coil", are
> resonating.  The latter is connected to a point of the first secondary turn
> about 3/4 turns from the grounding connection, nevertheless the streamers
> are powerful.  Other coils are connected to the same point while a ball 30"
> on a stand and a coil on a stand are connected to the last turn of the
> secondary.  Strong sparks were passing from top to bottom of extra coil and
> the secondary last turn shows strong streamers.  About 100 short flashes of
> throws of switch (controlling coil power -bill) and afterwards an exposure
> of 15 minutes to ordinary arc lamp placed in corner of building for the
> purpose of photography.  The arc light is much preferable to (pyrotechnic
> -bill) flash light as the time can be closely determined in each case.  The
> isochromatic plate is _decidedly_better_.  In this plate there is a red dye
> used in coloring the plate, otherwise it is the same as the Cramer "Crown".
> The plate used was "instantaneous Cramer isochromatic", same size as before.
> This observation suggests a line of experiment which might lead to useful
> results.  

	That comment suggests a multi-plate photograph technique which was, I'm
almost certain, already in use.  I think the use of a single plate
coated with starch granules of differing colors was also in use then,
but not widely.  The DuFay (sp?) process was indeed used and came along
somewhat later.  Is there a historian in the crowd?

Ed