Abstract: A handheld device is adapted to perform non-contact measurements to determine distances, angles, arc lengths and radii between select points on physical structures. The device is assembled and contained within a handheld, portable housing and includes various control and input keys, a visual display and three laser components. Each laser component includes a laser emitter including a laser emitter diode with an associated emitter lens. The laser emitters of the three laser components are set at fixed, predetermined angles relative to one another at the front end of the housing. Each laser component also includes a laser receiver with an associated detector lens correspondingly positioned in alignment with the emitter lens. The laser components are adapted to emit and receive light signals to collect image data representative of a straight line distance between a predetermined set point within the device and a point on the surface of the measured structure.

Abstract: A hardened photographic film is formed as a result of in situ generation of hardener by incorporating an aldehyde bisulfite in one layer and a nonhardening aldehyde in an adjacent layer. Preferred aldehyde bisulfite is glutaraldehyde bisulfite and preferred nonhardening aldehyde is orthosulfobenzaldehyde.

Abstract: A hardened photographic film is formed as a result of in situ generation of aldehyde hardener, by incorporating an aldehyde precursor in one layer and pyridine-N-oxide in an adjacent layer. Preferred aldehyde precursor is 1,5-dibromopentane or 1,5-dichloropentane.

Abstract: A process of forming a hardened photographic film by in situ generation of hardener by incorporating an aldehyde precursor alcohol in one layer and pyridinium chlorochromate in an adjacent layer. Preferred aldehyde precursor alcohol is 1,5-pentanediol or methanol.