Camera optics are far better than unaided human vision, and most aerial photographs contain clear images that are too ... Special reference materials, called keys, have been developed and compiled to aid interpreters. ... A good low power (up to 40 x) microscope, preferably a stereomicroscope, and a good 35- mm slide projector (Leitz Prado or equivalent) is also ... from simple biconvex and plano-convex plastic lenses in low-cost training instruments to first quality achromatic lenses.
|Title||:||Aerial discovery manual|
|Author||:||Carl H. Strandberg|
|Publisher||:||John Wiley & Sons Inc - 1967-12|