Re: [RBW] A study in Slope in Pictures

2014-01-07 Thread NickBull
I think you're mixing angle and slope as if they mean the same thing, e.g. when you say a 45% slope is actually a 100% grade and a sheer cliff is infinite grade. I think you mean a 45 degree angle is actually a 100% grade (or slope) and ... Slope is defined as rise over run; in calculus

Re: [RBW] A study in Slope in Pictures

2014-01-05 Thread Deacon Patrick
Och! Good catch, Eli. Daft beggar I am -- my mistake once again making it clear why I'm a theologian and not a mathematician. Grin. Thank you. I sen demonstrate this by writing sin instead of sine. Dumb me. Dummie! Grin. With abandon, Patrick On Saturday, January 4, 2014 6:14:42 PM UTC-7, Eli

Re: [RBW] A study in Slope in Pictures

2014-01-05 Thread Ron Mc
and I thought you were a theodologian. On Sunday, January 5, 2014 4:00:48 AM UTC-6, Deacon Patrick wrote: Och! Good catch, Eli. Daft beggar I am -- my mistake once again making it clear why I'm a theologian and not a mathematician. Grin. Thank you. I sen demonstrate this by writing sin

Re: [RBW] A study in Slope in Pictures

2014-01-05 Thread Deacon Patrick
Brilliant, Ron! Absolutely brilliant! With abandon, Patrick On Sunday, January 5, 2014 8:10:36 AM UTC-7, Ron Mc wrote: and I thought you were a theodologian. On Sunday, January 5, 2014 4:00:48 AM UTC-6, Deacon Patrick wrote: Och! Good catch, Eli. Daft beggar I am -- my mistake once again

[RBW] A study in Slope in Pictures

2014-01-04 Thread Deacon Patrick
Slopes in pictures so rarely show how steep it actually is. Here is a study, using Theodolite to show the actual degree of the slope and a photo without it. Theodolite (reveals it’s a 7˚ slope, or 12% grade): http://www.flickr.com/photos/32311885@N07/11755929135/ Plain photo (looks like 4-6%

Re: [RBW] A study in Slope in Pictures

2014-01-04 Thread Patrick Moore
Looks like fun (except for the cold). What is the difference between slope and grade? On Sat, Jan 4, 2014 at 10:36 AM, Deacon Patrick lamontg...@mac.com wrote: Slopes in pictures so rarely show how steep it actually is. Here is a study, using Theodolite to show the actual degree of the slope

Re: [RBW] A study in Slope in Pictures

2014-01-04 Thread Patrick Moore
Has anyone used this? https://itunes.apple.com/us/app/theodolite/id339393884?mt=8 Is it good for quickly finding approximate ... no sure if I want slopes or grades ... of the hills I ride? (I simply want to find out how steep my hills are. For reasons of self esteem.) Are there better ways for

Re: [RBW] A study in Slope in Pictures

2014-01-04 Thread Deacon Patrick
I'll let someone smarter than me delve into the details, but if you take the degree of a slope and get it's sin you have the percent of the grade. Since I'm (and most of us) more familiar with the % rather than the degree, I translate it. Yes, Theodolite is the app I used for the photo. It's

Re: [RBW] A study in Slope in Pictures

2014-01-04 Thread Eli Daniel
Wow, of all topics to get me to de-lurk, it's this one! I've always naively assumed that % grade was just a fraction of 90 degrees -- eg, a 45 degree slope would be a 50% grade. If it is based on the sine of the angle (the ratio of vertical rise to distance along the road) as Patrick says, then