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The Metalfilm high-temperature strain gage (Fig. 1) was designed to achieve maximum conformability to irregular surfaces. Lateral stability of the unmounted grid was achieved by employing unique extensions of the grid and by making the width of each element approximately one hundred times its thickness. Thus, the mass was extremely small and the surface-to-mass ratio high. Superior bonding strength was achieved. (These gages have been operated at 100,000 g.) An effort was made to reduce drastically the stress concentrations common to other strain gages. Removing the Metalfilm gage from its temporary backing is simple. Cementing it in place is easy. Suitable grids may be cemented to other backing materials to form premounted gages. The side bars provide mechanical protection for the grid. Lead wire ribbons, approximately ten times the thickness of the gage, connect the strain gage tabs with the lead wires by spot welding. Two basic grid configurations are available: (1) one whose width is twice its length, and (2) one whose width is equal to its length. Six effective lengths are standard:
Bean, William T.
Research Consultant, Tatnall Measuring Systems Co., Detroit, Mich.