(1845) Willats's Scientific Manuals: No.1 Plain Directions for Obtaining Photographic Pictures by the Calotype & Energiatype
Mirrors and lenses
Compound microscopy
Microscope: Then and Now
Interaction
TELESCOPIC ASTRONOMY. What is a telescope? What are telescopes used for? View distant objects Collect light.
Birkenes, Robert. "Pay-view-scope looking out over the Niagara Falls.“ Flickr. Yahoo!, 24 July 2007. Web. 8 Feb. 2011. "From My Blog - Cloning A Form."
lenses
Basics Astronomy 1.3
Martin Crow Crayford Manor House Astronomical Society Instruments.
Interaction Jing Li CPSC 533C March 3, 2003. Overview Toolglass and Magic Lenses: The See- Through Interface (1993) by Eric A. Bier, Maureen C. Stone,
