A bridge, comprising a set of arches, each extending longitudinally along the bridge, including at least one central arch and at least two side arches, symmetrically disposed about the central arch. The invention provides an optical measurement apparatus using total reflection, including a light source, a measurement optical system, and a light detector. The sealing strip in this portion is intended to be pinched into the groove. For each request from a subscriber, subscriber-specific data is retrieved from the table and a data communications notification that incorporates the retrieved information is communicated to a voicedata communications device to provide an updated voice mailbox message status. For example, a method may include containing a cement fluid composition in a flow path comprising a wellbore; and optically interacting the cement fluid composition with an integrated computational element, thereby generating an output signal corresponding to a characteristic of the cement fluid composition, the integrated computational element being coupled to a tool.