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![]() Maker: Weston Electrical Instrument Model: Model 617 (Type 1) Circa: 1932 Designer: William N. Goodwin US Patent: 2,073,790 Original Price: $39.75 Cell type: Selenium Measure type: Reflecting/averaging |
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There's a button on the right side, along the top, which sits right under the user's index finger, which is used for changing the scale sensitivity of the meter. The meter normally reads for bright light (0-1,300 foot-candles), but if you press the button, the scale is 0-130 foot-candles (low-light). My General Electric from this period requires you to put a metal mask over the cell to cut the light.
They tried a tube but didn't like it. Ultimately they consulted with a cinema engineer who suggested a honeycomb-type baffle. Goodwin claimed this was the final piece of the puzzle, and they put the meter up for sale. I know all this little bit because DeJur used the "honeycomb" on their meters. Weston sued them for infrigement, and a synopsis of its development ended up in the Federal Reporter (see Weston v. DeJur). Weston lost on the grounds that the honeycomb idea wasn't patentable. Here's another interesting web page for this meter: Scott's Photographica Collection. |