workshop drawing with rooftop grating arrangement
workshop drawing with rooftop grating arrangement
workshop drawing with concave grating arrangement
mechanical layout at TNG
optical layout (one [OIII] arm)
optical layout (Halpha arm)
sketch of beam at grating
for various cases
V18 sketch (from v18-5.dwg)
Following, showing construction of the aluminium housing, supplied by Jan Idserda at NFRA, October 1999:
Following, showing the lenses in various stages of completion at RSAA (Mt Stromlo) taken by Nigel Douglas on February 15 2000.
Following, showing the housing near completion at ASTRON, sent by Jan Idserda on March 17 2000.
Following, showing the camera mounts at ASTRON, sent by Jan Idserda on April 3 2000.
Following, showing the camera and collimator housings, in "OIII green" (RAL 6016), taken at ASTRON by Nigel on May 12 2000.
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| ASTRON7 | ASTRON8 | ASTRON9 | ASTRON11 | ASTRON11 | ASTRON12 |
Image of the 600 g/mm gratings from Richardson Labs (Gabe Bloxham, Sep 21 2000, at MSO).
Upon unpacking (Sep 14) Gabe found cosmetic defects, best described as several visual lines, in same direction as the rulings. One extends to about 1/2 length of the grating.
Apart from a few small spots, the cosmetic lines are visible, near the left edge on left grating, and near center on the right grating.
click to enlarge