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| Keywords: DentalResearch 010.jpg Detail of NBS dental comparator showing the variable parallelogram or pantograph The guide pointer left is permanently positioned while the indicator pointer is capable of vertical movement The dial indicator right indicates the difference in height of the surface traced by the indicator in relation to that traced by the guide The larger dial indicator registers the change in shape of the parallelogram The lock plate right holds the parallelogram in a definite forward-backward position while measurements are being made National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Plastics Rubber industry Dentistry | ||||
