Hi William,James Lee is not helpfull for construction details.
Not sure what you are referring to, the masts, the tops, something else. The information from David Steel is probably the most worthwhile unless there are drawings for Agamemnon specifically.
While not appropriate for Agamemnon necessarily the 1719 Establishment pages at RMG give a lot of details that may be helpful for anyone interested for earlier vessels. It has informaation on the tops, trestle trees, masts, etc.
Couple pages as an example follows.


There are a number of high resolution drawings of masts and yards on the Wiki Commons site and hundreds in low resolution on the RMG Collections site.

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