- Empire Trust later assigned management of the property to one of its own subsidiaries, The Actinograph Corp ., which held it until 1948.
- There were many specialized slide rules for photographic applications; for example, the actinograph of Hurter and Driffield was a two-slide boxwood, brass, and cardboard device for estimating exposure from time of day, time of year, and latitude.
- In 1911, Arthur William Clayden M . A . ( Fellow of the Royal Meteorological Society and Principal of the Royal Albert Memorial University College of Exeter ) developed a version of an actinograph for meteorologists, to observe and record the change of radiation.
- The earliest actinographs were 24-hour recording devices, using a rotating cylinder of photographic paper exposed through a wedged-shaped slit to record a graph of actinic light during the period of a day; hence the " graph " suffix in " actinograph ".