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Special Field Orders No. 15. Headquarters Military Division of the Mississippi, In the Field, Savannah, Ga., January 16, 1865. I. The islands from Charleston south, the abandoned rice-fields along the rivers for thirty miles back from the sea, and the country bordering the Saint Johns River, Fla., are reserved and set apart for the settlement of the Negros now made free by the acts of war and ...
[5] [6] The Mission fig is a high quality fig variety. It produces both a breba and main crop, and is considered an everbearing variety when planted in the right climate. The breba crop is large. The main crop is medium-sized. It is a dark skinned fig with a strawberry colored interior. The skin of the fruit often cracks when it is ripe.
The higher the twilight factor, mathematically, the better the resolution of the binoculars when observing under dim light conditions. Mathematically, 7×50 binoculars have exactly the same twilight factor as 70×5 ones, but 70×5 binoculars are useless during twilight and also in well-lit conditions as they would offer only a 0.14 mm exit pupil.
Angular field of view is typically specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5.8 degree (angular) field of view might be advertised as having a (linear) field of view of 102 mm per meter. As long as the FOV is less than about 10 degrees or so, the following approximation formulas ...
Figs and fig wasps have had a symbiotic relationship throughout history. [8] The fig wasps need the figs in order to reproduce, while the figs rely on the wasps to aid them in their pollination. [9] In wilder forms of the plant, without pollination the young developing fig will fall off of the tree without ripening.
The fig is the edible fruit of Ficus carica, a species of small tree in the flowering plant family Moraceae, native to the Mediterranean region, together with western and southern Asia. It has been cultivated since ancient times and is now widely grown throughout the world. [ 3][ 4] Ficus carica is the type species of the genus Ficus ...
Field flattener lens is a type of lens used in modern binocular designs [a] and in astronomic telescopes to improve edge sharpness. Field flattener lenses counteract the Petzval field curvature of an optical system, mitigating the field-angle dependence of the focal length of a system.
Petzval field curvature, named for Joseph Petzval, [ 1] describes the optical aberration in which a flat object normal to the optical axis (or a non-flat object past the hyperfocal distance) cannot be brought properly into focus on a flat image plane. [citation needed] Field curvature can be corrected with the use of a field flattener, designs ...