You searched for: “roentgenometer”
roentgenometer, radiometer
1. An instrument for measuring the intensity of radiation.
2. An instrument designed for measuring the mechanical effect of radiant energy.

It consists of a number of light discs, blackened on one side, placed at the ends of extended arms, supported on a pivot in an exhausted glass vessel.

When exposed to rays of light or heat, the arms rotate.

This entry is located in the following units: meter-, metro-, metr-, -metrical, -metrically, -metron, -metric, -metrist, -meter, -meters, -metry, -metre (page 35) roentgeno-, roentgen- + (page 2)