ASTRONOMY
& SPACE FEB 2016
& SPACE FEB 2016
STORY OF THE REFLECTOR
1. THE PIONEERS
Some of the earlier cameras of
the Harvard Observatory patrol program. They were mounted on this special
platform at the Oak Ridge station in Harvard, Massachusetts.
In 1935 Henry Sawyer became the
night assistant at Oak Ridge. Among the tens of thousands of high-quality
plates that Sawyer took in the next 15 years was a series with the 16-inch
wide-angle Metcalf refractor. It covered the northern sky to about magnitude 18
and was used by Harlow Shapley for his studies of the distribution of galaxies.
Every graduate student and visiting astronomer who worked at Oak Ridge during
those years remembers Henry Sawyer as the stogie-smoking gray-haired Yankee in
the fur cap. He owned five elderly cars in varying states of disrepair, but by
transferring parts from one to another he could always manage to drive one of
them from his home in West Acton to the station. An unusual feature of this
home was a milling machine in the middle of the parlour.
Here Henry A. Sawyer loads a plate into the 16-inch Metcalf refractor at
Harvard's Oak Ridge station in Massachusetts. The lightproof cloth shroud was
used because the plate was put directly into the camera back, without a holder.
A partial vacuum bent the glass against a metal template that matched the curved
focal surface. The eyepiece in the guide telescope may well be one of the
Coddington oculars Sawyer used to make of Lucite. Photograph by P. Southwick.
For many years a large part of
the astronomical research done at Harvard Observatory used the photographs
Sawyer had taken.
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