A selection of drawings and sketches from out collection:
Drawing of preparing the polisher (pouring the pitch lap), no date, R. W. Porter. Gift from Alan Mackintosh.
“Porterian Reflecting Telescope,” blueprint of design for a turret telescope by R. W. Porter, April, 1920.
Photo of R. W. Porter with the Garden Telescopes at the Jones and Lamson Machine Tool Company, Springfield, Vermont.
Drawing depicting how the knife-edge produces shadows, 1936, 12x8 inches, R. W. Porter. Gift from Miriam Houston, 1995.
Procedure for making a roof prism, likely dating from World War II, as Porter led a nation-wide effort to make roof prisms for the war.
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