Identification of Sir Raman's handheld scope I read an article somewhere around 5-10 years ago that talked a little bit about the life of Sir C. V. Raman. The focus was on the effect of Raman spectroscopy but included an interesting little tidbit. 

Sir Raman apparently used to carry a small handheld scope of some description which allowed him to examine an object and only see the scattered light. He would always keep it in his pocket so that he could pick a flower or look at an everyday object and see how it changed. The article included a photo of him using it. I think I even remember seeing a video of him using it. As I recall, it was a small tube, about a hands length in size, and I think it was made from brass. 

What was that tube, how did it work, and is there a resource for me to get one of my own?
Sir Martyn Poliakoff did the video about the spectroscope on his Periodic Videos channel on youtube. 

To my knowledge, he presented the original instrument but did not mention where to obtain a replica.