Hey Mike -- thanks for the tip! I'm always pleased to learn about exploits from the Harvard Observatory in the first half of the last century. A lot transpired then in the understanding of the universe. From Shapley's Wikipedia bio: "Shapley fiercely critiqued Hubble and regarded his work as junk science. However, after he received a letter from Hubble showing Hubble's observed light curve of V1...he withdrew his criticism. He reportedly told a colleague, "Here is the letter that destroyed my universe." ....Hubble's findings went on to fundamentally reshape the scientific view of the universe.
Despite having earlier argued strongly against the idea of galaxies other than our Milky Way, Shapley went on to make significant progress in the research of the distribution of galaxies, working between 1925 and 1932. In this time period, with the Harvard College Observatory, he worked to map 76,000 galaxies."
Sawyer's Bio is equally interesting -- I encourage people to check out both. "Following the expectations and work ethic of Dr. Shapley, Hogg worked hard, long hours measuring the size and brightness of globular clusters and published several papers.[3] Hogg received her master's degree in 1928 and her doctoral degree in 1931, both from Radcliffe College, as Harvard refused to award graduate degrees in science to women at the time."
So here's your payoff for the cool reference:
M12 (archetype for Shapley-Sawyer Class IX, "Loose towards the Center")
Same tech details: Q3.5/ZWO ASI 533MC Pro/15 min unguided 4 -8 second exposures, processed in PixInsight
I suspect Dr. Sawyer would have enjoyed the lifestyle benefit of a Questar and CMOS camera... "[Sawyer] was able to continue her observation work by bringing her sleeping daughter with her to the observatory at night in a basket. The observatory's director, Dr. J.S. Plaskett, also was supportive; he gave Helen Sawyer Hogg a research grant of $200, which she used to hire a full-time housekeeper for an entire year, providing further support for her research work."