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FEM Finite Element Modeling, a computer-modeling technique for measuring
stresses; used in Joshua design to significantly increase strength and
reliability of camera structures.
Film Carrier Frame on Film Chamber Door which positions Filmpack.
Film Chamber Compartment in Joshua for holding finished pictures.
Film Door Access door to Film Chamber.
Film Shade Sliding metal cover actuated by Pick mechanism, to prevent light-striking
unexposed film via light-piping through mylar layer.
Film Speed Switch Compensates exposure for slow film pack; actuated if film pack has no notch
(normal pack has notch); part of Logic wireform Switch.
Fill Flash Use of strobe to add to ambient light, to produce satisfactory exposure.
Flash Fire Aperture Shutter blade aperture at which the strobe should be fired to produce
optimum exposure and sharp focus.
Flex, Interconnect Flexible mylar printed wiring to connect camera power source and circuits.
Focus Zone Near or far zone occupied by subject, which determines whether near (front)
lens system only, or near and far focus lenses will be used.
Folded Refers to Camera in collapsed position (opposite to erected).
Framing Field Area seen in viewfinder; in Joshua, same as photographic field.
Fresnel Focusing Screen A highly reflective screen employing concentric Fresnel rings, to provide
uniform brightness over the entire image area.
Full Chamber Link Actuated by the 10th film frame to enter Film Chamber (or by a film jam);
closes Full Chamber Switch on Logic Switch to inhibit operation of Camera.
Gear, Timing Key element of Drive System; has cams on front and back which control
DKEC, Pick Carrier and Recock Link.
GND Ground wireform of Power Switch. When shorted to VER, discharges
capacitor in Power Supply, shuts off power from all circuits.
Hiccup Very brief Motor run when Camera is erected, to complete previous camera
cycle left unfinished when power was broken.
Hybrid Quench Energy-saving strobe quench method incorporating approximately 0.4 stop
excess aperture to compensate for system inaccuracies.
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