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In a photography method, a partial vacuum is provided within a pressure housing of a camera having an unexposed film unit. The camera is sealed against both air entry and venting, while in the partial vacuum. The camera is kept sealed until the film unit is fully exposed and while sealed, a relative

In a photography method, a partial vacuum is provided within a pressure housing of a camera having an unexposed film unit. The camera is sealed against both air entry and venting, while in the partial vacuum. The camera is kept sealed until the film unit is fully exposed and while sealed, a relative pressure differential between the interior of the camera and an environment external to the camera is continuous indicated. The camera has a housing having an internal cavity water-tightly sealed from the external environment. The internal cavity has an unsubmerged internal pressure, at room temperature, less than air pressure at sea level. The camera has a camera frame assembly disposed in the internal cavity and a seal integrity indicator that provides the continuous indication of the relative pressure differential.

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In a photography method, a partial vacuum is provided within a pressure housing of a camera having an unexposed film unit. The camera is sealed against both air entry and venting, while in the partial vacuum. The camera is kept sealed until the film unit is fully exposed and while sealed, a relative

In a photography method, a partial vacuum is provided within a pressure housing of a camera having an unexposed film unit. The camera is sealed against both air entry and venting, while in the partial vacuum. The camera is kept sealed until the film unit is fully exposed and while sealed, a relative pressure differential between the interior of the camera and an environment external to the camera is continuous indicated. The camera has a housing having an internal cavity water-tightly sealed from the external environment. The internal cavity has an unsubmerged internal pressure, at room temperature, less than air pressure at sea level. The camera has a camera frame assembly disposed in the internal cavity and a seal integrity indicator that provides the continuous indication of the relative pressure differential. mentary equipment and to a voice input/output unit electrically separate from the terminal equipment. Outgoing signals are generated by the supplementary equipment and/or by the voice input/output unit and are, in turn, fed into the network access line. Conversely, dialing and other control signals are transmitted directly between terminal equipment and telephone network via the network access line.