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716 Photography thumb thumb thumb thumb thumb
TAKING FILM PHOTOGRAPHS AT NIGHT
To compensate for reciprocity failure in night-time photography, open the aperture one additional f-stop if exposure time is more than 1 second, 2 f-stops if the exposure is over 10 seconds, and 3 f-stops if the exposure is more than 100 seconds.
Ernst Luposchainsky III, celestial photographer, inter alia, Hollywood, California
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5594 Ages and Stages
DIFICULT DEBUGGING
If it is taking more than a day to debug some code, start rewriting the code. It may provide some insight that will allow you to find and fix the bug. Otherwise, in the end, you will have working code to rwplace the buggy code.
James S Sorrells, Retired Software Engineer, Allentown, New Jersey, United States
(1) Contributions from this contributor since (2016-01-19)
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5593 Radio
PROPER PRONOUNCIATION OF SMALL US TOWNS.
My wife's cousin Dave, the play-by-play radio announcer for the Marlins, calls after hours to the main library of the town in question. The recording gives the (correctly pronounced) name of the town, so when he speaks it on air that night he pronounces it like the natives.
Will Varnell MD, Radiologist, Birmingham, AL, USA
(4) Contributions from this contributor since (2013-12-22)
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5590 Business
MORE DIGITS MEANS MORE MUZAK
The time you can expect to spend waiting on hold for customer service is proportional to the length of your account number.
Jay Miller, Engineer, Damascus, Maryland, United States
(1) Contributions from this contributor since (2015-10-08)
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5589 Ages and Stages thumb thumb thumb thumb thumb thumb
A PINT'S A POUND, THE WORLD AROUND
A pint's a pound, the world around. For liquids, starting with water and beer. A Gallon weighs about 8 pounds.
Buck Trawicky, wright & scholar, Madison, Wisconsin, USA
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5586 Ages and Stages thumb thumb thumb
PLUMBERS' AND PRINTERS' RULE OF THUMB
Never eat the last inch of your sandwich.
Randal Bundy, General Contractor, Oakland, CA, Randal Bundy
(1) Contributions from this contributor since (2015-07-08)
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5585 Driving
TRAFFIC LANES & SATETY
According to a Kentucky Transportation Dept. traffic study in 1980, an increase in the number of traffic lanes, results in a 10-30 percent decrease in traffic accidents across varying traffic flow densities.
Dave Agresti, Prof Criminology (retired), Tampa, Florida, United States
(90) Contributions from this contributor since (2008-04-15)
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5584 Tools thumb thumb thumb thumb thumb
SCREW ATTACHMENTS
Righty Tighty Lefty Loosey Except for water hoses.
Brian Bickel, Endodontist, TX
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5582 Electricity thumb thumb thumb thumb thumb thumb thumb
CHOOSING A PULL-UP RESISTOR
When selecting a pull-up resistor to prevent a floating state, the general rule is to use a pull-up resistor that is an order of magnitude (1/10th) less than the input impedance of the input pin. For example, if you use a 1MΩ resistor for the pull-up and the input pin’s impedance is on the order of 1MΩ, the voltage on the input pin is going to be around half of VCC, and the microcontroller might not register the pin being in a high state. Is it a high or a low? A resistance of 10k to 100kΩ for R1 should avoid most problems.
Joseph Bauer, Master Carpenter, Indian Hills, Ohio, USA
(41) Contributions from this contributor since (2008-01-08)
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