I thought usually those light meters used cadmium sulphide photocells? I don’t think they actually produced enough power to be useful in that way? Do they even have a photovoltaic effect? I always thought of them as photo resistive.
the meter moves, which takes power, plus the simple fact that all matter is photo active in some way, ie: light will move electrons around in everything
we could stretch the whole thing out, and point to increased lift in montgolfiers balloons, durring daylight as solar assisted device, or sail boats, as wind is derived from solar heating, or eating salad
the point is that there is nothing new under the sun and that a little absurdity never hurt anyone
My memories of ancient light meters involved a battery, but I might be conflating those memories with me plugging in a cadmium sulphide photocell to my shiny new analog multimeter. I was like 7 at the time, so who knows.
Paywall. Clickbait title. Checks out.
Referring to batteries in low power devices like keyboards and calculators… so just like what’s been on the market for 3 decades?
longer,light meters for film cameras back to the 1950's? further back
I thought usually those light meters used cadmium sulphide photocells? I don’t think they actually produced enough power to be useful in that way? Do they even have a photovoltaic effect? I always thought of them as photo resistive.
the meter moves, which takes power, plus the simple fact that all matter is photo active in some way, ie: light will move electrons around in everything we could stretch the whole thing out, and point to increased lift in montgolfiers balloons, durring daylight as solar assisted device, or sail boats, as wind is derived from solar heating, or eating salad the point is that there is nothing new under the sun and that a little absurdity never hurt anyone
My memories of ancient light meters involved a battery, but I might be conflating those memories with me plugging in a cadmium sulphide photocell to my shiny new analog multimeter. I was like 7 at the time, so who knows.
OTOH I -need- a salad powered calculator.