little help, please

[phuphuphnik]

I'm working the kinks out of a Lockyer style spectrometer, and I am having a few issues. Where should the second telescope focus, the slit?
To better explain, as y'all know it goes objective, slit, lens, prism chain, then the second telescope. I'm getting lovely projection of the lines on a bit of card, but I'd really like to finish it up.


I'll be adding another slit for a prominence spectroscope, then eventually a spectrograph, but one thing at a time.

[Merlin66]

<name?>,
An interesting project....a four prism train is a challenge to align!!
The imaging telescope behind the prisms should be focused to infinity if the set-up is correctly collimated.

[phuphuphnik]

Have the final form just about there. Need to work on focus and putting a brass box around it to shade the light. That is a Mercury lamp at the end there. I can see the lines, but they are not sharp because it is so lose, I think.
I am also putting together a wire diffraction grating to make a little Fraunhofer spectroscope. Also in the works is a ruling engine to make some gratings.
Cheers,
Chriso

[Merlin66]

Chriso,
Very nice.
You should consider the Browning mechanism to keep all the prisms working at maximum efficiency at their minimum deviation angles....

Browning aligned prisms 1870.pdf

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