[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
Re: [ATM] mobsby null test
Hi,
I successfully accomplished the Mosby-0-test. I produced a picture of
the grating with the program of Mark D. Holm.. I photographed the
picture with a SLR camera on black-and-white film. I used the negative
in place of a Ronchi grating. You see the lines like testing a spherical
mirror by means of a strait grating. The most important point is that
the slide has to be in the correct place in the path of rays. As
source of light I used a lamp with aluminum foil before it. In the
aluminum foil is a hole of a very fine needle. Put the aluminum foil on
a very hard surface e.g. to steel, so that the needle cannot go through
aluminum, but forms only a very small impression. The web site of M.Holm is:
http://www.atmsite.org/contrib/Holm/invron/invron.html
Sincerely Marty
Guy Brandenburg schrieb:
>I and a couple of others have just finished attempting
>to use the Mobsby Null Test that is sold by
>Willmann-Bell, and I have to say that I am extremely
>frustrated. It took me quite a while to fabricate a
>really high-intensity light source (we cannibalized
>some Ikea halogen lights for their switch, their
>transformer, and their light bulbs). We also used a
>fairly large fan to keep everything from getting too
>hot. I made a box to house everything, partly from
>wood and partly from sheet metal. We frosted some
>glass, manually, and made a teeny-tiny hole in some
>glass. But everything is so tiny that we ended up not
>really being able to see much of anything. In fact,
>when I used the built-in knife-edge, sometimes it
>seemed to cut off a shadow fromt he right; sometimes
>from above; and sometimes from above, all without me
>doing much of anything. As far as seeing anything like
>what I thought you were supposed to see with the
>3-line reverse Mobsby Null test -- hah!
>
>Has anybody else actually tried using one of these
>slides, and with how much success?
>
>Guy Brandenburg
>
>=====
>Guy Brandenburg
>Washington, DC
>My home page:
>http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
>_______________________________________________
>ATM mailing list http://www.atmlist.net/
>
>
>
--
"Mit der Einführung der Planung ersetzt man den Zufall durch den Irrtum"! (Peter Ustinov)
("By planing you replace hazard by error" Peter Ustinov)
Homepage: www.marty-atm.de
Angebote: www.marty-atm.de/Preisliste.txt
_______________________________________________
ATM mailing list http://www.atmlist.net/