Andy Bank wrote:I have experience with manual cameras. Kodak film boxes had exposure suggestions printed on the inside surface of the box that pertained to that specific film speed. Older films had a removable info sheet. The info still applies today no matter how old the film. ASA film speeds are what I'm familiar with. Read about film speeds here: https://en.wikipedia.org/wiki/Film_speed The chart will compare ASA to DIN. From this point forward I will use ASA film speeds. A good general use film speed is ASA 400. Set your camera shutter speed to 1/500 (whatever shutter speed is closest to the film speed). Corresponding lens openings (f-stop) go like this: full sun f16, light hazy sun f11, hazy sun f8, bright cloudy sky f5.6, cloudy sky f4.5, dark cloudy sky f3.2 maybe f2.8. If you change the film speed for creative applications for example (shutter speed 1/250 which doubles the exposure time) you need to decrease the light reaching the film by double f11 is used instead of f8, f8 instead of f5.6 etc.. Every time you change the shutter speed you are either doubling the amount of light reaching the film or cutting it in half. If you double it at the shutter you have to cut it in half at the lens opening. Example: 1/500 and f16, 1/250 and f11, 1/125 and f8, 1/60 and f5.4 etc. will all give you the same exposure on the film. The amount of in focus subject matter (depth of field) (what's in focus, what's not) will change. f16 large depth of field, f5.4 not as much in focus and so on. Fast shutter speeds (1/500) stop action, slower shutter speeds 1/60 moving subjects might be blurry. A camera with a built-in light meter is great if you know how to use it, they can be fooled. A light meter is assuming the exposure is 50% white and 50% black. Any variance fools the meter and you into recording the wrong exposure. To much dark area = over exposure, to much light = under exposure. Take notes for every picture, film speed, shutter speed, lens opening, lighting conditions. When you receive your prints you can see if your camera settings were correct or needed adjusting. Most of all practice, practice practice. Using your digital for exposure recommendations will work but why? You won't learn anything that way.
Julie Reed wrote:Len Ovens: “Some people however, would feel a line has been crossed and the heater is now a masonry heater even though it uses the same principles in it's operation.“
Are you meaning same principles as RMH, or same as masonry heater?
I’m barely at novice level for knowledge about either of these, but from the masonry heaters I’ve seen (Russian Fireplace, etc) the principles don’t seem to be the same, aside from heating a mass. The masonry heaters appear to be a firebox beneath a zigzag flue which eventually exits a vertical stack as cool gasses (co2, h2o). The mass has time to absorb the heat, but is there a high temp and/or secondary burn such as occurs in the RMH? The one I knew the most about was built by an ‘old country’ German couple, and they ran a hot fire for about 3 days, then the entire mass was warm and they built daily small fires to maintain that level. After the initial burn it didn’t use much wood to heat their large chalet style house, but the heater was probably 6’ square and occupied the center of both levels. I did various work for them in my late teens, and learned early the value of thermal mass.
r ranson wrote:Here's the photo taken with the argus:
and here is the photo taken with the digital camera (ISO 100, f8, 1/200)
Victor Skaggs wrote:
Len Ovens wrote:
What not to do about climate change:
Don't: Lobby for government action. First off, it is unlikely any government action will have the desired effect as the government is guided by rich companies and single minded emotional groups. The other thing is that any action the government can take will hurt the poor... while still doing nothing to change things.
Here again is the notion that govt is inevitably wrong and evil. Really? Should we then not bother voting?
The USA govt has done a number of things which have benefited this society. TVA. Medicare. WPA. NASA. Civil Rights Bill. Environmental regs.
In the end, in fact you are part of a large global population as well as national, state and local communities. Nobody is an independent actor. Nobody makes decisions which are not affected by the possibilities and restrictions instituted by governments, corporations, and other structural forces.
If govt does nothing, then the other powers, which mostly means corporations, will be making the decisions and taking all the action, and so do we really think we can trust the Koch Bros. more than the USA govt? The mythical "free market" should control everything?
Weak central govts are a hallmark of feudalism and other great ills.
Tyler Ludens wrote:
Len Ovens wrote: Climate change is not the end of the world, it will change our world for sure but we are better to figure out how to live in this new world rather than change the world.
I believe permaculture can rapidly and dramatically change the world for the better. Wide-scale implementation of regenerative techniques could diminish many of the bad effects of climate change, especially at the local level, but also in the larger climate picture.
I for one don't intend to sit around waiting for my land to turn to eroded desert, but instead I am implementing regenerative techniques for a water-retentive landscape. My neighbors might notice the difference and choose to implement these techniques as well.
Andreas Kaubisch wrote:"And finally, not a battery at all, are projects like the Kilowatt. A 1 to 10K thermonuclear generator being developed by NASA for use off world. They last 10 years... at full output, but can be throttled. Probably safer than any of the batteries discussed above. Capturing the waste heat rather than radiating it would probably double it's effective output. Sunshine or rain not a problem, no snow removal needed. I suspect the liquid salt reactor would be too big for the average homestead, but probably ideal for a small community. (it would also be an ideal place to get rid of spent fuel from kilopower generators used on local homesteads."
'thermonuclear generator' - what are the waste products of this process? Something radiocative?
Also not sure about the wisdom of putting thermonuclear devices in the hands of homesteaders all over the world.... maybe I am not clear on the technology you are referring to?
Shawn Klassen-Koop wrote:Interesting. I'm wondering, would a stratification chamber bench for inside a house be heavier or lighter than a pebble-style bench?
Grant Holle wrote:
Len Ovens wrote:
Grant Holle wrote:Didn't know where to put this idea, and this thread seems as good as any.
Would it be possible to take Walker's half barrel design and turn it into a pit roast alternative?
tilt the barrel slightly down towards the door as the bottom may collect water from your cooking and the flue gas as it will take longer for the mass around the chamber to warm up if it is warming up the food mass as well.
I really appreciate your advice and design modifications.