Radical Focusable Dvs 5 Prism Spectroscope Fr Gems W Wavelength Scale & Slit Adjustment

I decided to play with this DVS after reading some literature on the original Direct Vision Spectroscopes by Hoffman and Jansen. While these kind of spectroscopes typically get used in the Gems & Jewelry industry, I just wanted to use it for the fun of it. I wish the Alignment of the scale had been a little better. It can be adjusted with the provided screws; but came in misaligned when shipped. That's just a minor lament. As a college kid, after being used to the Table Spectrometer, it felt good to see the miniaturized spectroscope being manufactured in India. I disassembled it to see the 5-prism assembly as well. I'm not sure these days if the ground glass and flint glass prisms are separated by Canada Balsam or some other epoxy; but this gadget can surely be calibrated and is a joy to play with, if only to validate the wavelengths from known crystals in the visible spectrum. As some other reviewer mentioned, a more detailed manual accompanying this spectroscope would've been nice-to-have.

I included a picture so you can see the size of the instrument compared to my hand. It corresponds to the middle spectrascope shown in Liddicoats Gem Book. The instrument is hefty, sturdy and well made. It is made in India and comes in a padded wooden box. They ship DHL with a signature required. Well packaged and safely shipped.

Very well-made. Precision instrument. It also gives me great satisfaction to know this is the same type of spectrometer that CV Raman carried around in his pocket on his days off.

A wonderful tool for gem testing laboratory. I bought it. It's the best deal because buying a direct vision spectroscope is very expensive.. gemologists have external light source...so this can be used instead of diffraction spectroscope. Very beautiful bands are visible. Honestly I could hardly see through diffraction grating spectroscope.

Hazy spectrum. I do not think the spectrum is upto the mark.