Hope with an "actinometer," and obtained results agreeing quite satisfactorily with those derived by Pouillet from experiments made in.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

In essence the whole shebang had become a giant actinometer.    From Wordnik.com.  [Archive 2007-12-01] Reference

For judging long exposures, the use of an actinometer (issued in many inexpensive forms) is helpful.    From Wordnik.com.  [How to Observe in Archaeology] Reference

The mystery was not a new type of infernal machine as they imagined but merely a home-made actinometer!.    From Wordnik.com.  [Sixteen Months in Four German Prisons Wesel, Sennelager, Klingelputz, Ruhleben] Reference

The few actinometer observations will be found in another part of the Appendix.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

It was very easy work for me and I took several photographs of the ponies plunging along -- the light very strong at 3 (Watkins actinometer).    From Wordnik.com.  [Scott's Last Expedition Volume I] Reference

Another object was, to bring down specimens of air from different altitudes, for analysis; to try the effect of the actinometer at great elevations; and to note the hygrometric condition.    From Wordnik.com.  [Chambers's Edinburgh Journal, No. 456 Volume 18, New Series, September 25, 1852] Reference

The few actinometer observations which I was enabled to record, were made with two of these instruments constructed by Barrow, and had the bulbs of their thermometers plunged into the fluid of the chamber.    From Wordnik.com.  [Himalayan Journals — Complete] Reference