| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| danbeavers | "Answering my own question: "The KITAGAWA air sampling pump reproducibly draws 100cc of sample air" So that would be 90 pump cycles thus makiing i..." | Read more » | almost 10 years ago | |||
| danbeavers | "Mathew: Perhaps I am not understanding some objectives here. Is the idea to be able to use one of our measurements in court? I doubt that that i..." | Read more » | almost 10 years ago | |||
| nshapiro | "I think this looks great! The air intake is in one end of the tube. so we could have one less inlet to cut in the top panel and we could have it s..." | Read more » | almost 10 years ago | |||
| mathew | "I'm trying to think about how everything might go together for shipping-- I'd like to put the monitor in a plastic suitcase with a top panel cut to..." | Read more » | almost 10 years ago | |||
| mathew | "@Danbeavers If you ream it you're right-- I was thinking about just a drill hole and that note. Vibrations on either a cheap drill or a poorly secu..." | Read more » | almost 10 years ago | |||
| nshapiro | "+1 to the time relay delay it could be adhered to the belly of the pump. Digging the flow meter debate! " | Read more » | almost 10 years ago | |||
| danbeavers | "Mathew: Why would you doubt the accuracy of a stepped bore? A reamer will provide very accurate hole size and ball bearings have very accurate di..." | Read more » | almost 10 years ago | |||
| mathew | "@danbeavers hmm... the variability in the break and its effect on flow could be quantified with a more accurate flow meter. I wonder how variable ..." | Read more » | almost 10 years ago | |||
| danbeavers | "Another approach to this problem would be essentially what Drager does. We could construct a manual vacuum pump. It would essentially be like a b..." | Read more » | almost 10 years ago | |||
| danbeavers | "Thanks Nate for posting my thoughts. I wanted to comment on Mathew's idea of calibrating the pump before shipment. I assume what is meant is that..." | Read more » | almost 10 years ago | |||
| nshapiro | "@danbeavers just sent me a great email about cheap flow meters. he told me I could repost it, so am putting it here: "I have been thinking/researc..." | Read more » | almost 10 years ago | |||
| nshapiro | "Gotcha. In my testing in 2011 i did some of the test and mailed test kits to those i couldn't meet in person. altho it wasn't statistically signifi..." | Read more » | almost 10 years ago | |||
| mathew | "The vintage timers are probably far too massive. I'm not as worried about tampering as I am about good faith forgetfulness-- I don't always hear t..." | Read more » | almost 10 years ago | |||
| nshapiro | "This is great. The vintage timers are pretty amazing although they add a lot of weight and thus money and are not tamper proof. We could just inclu..." | Read more » | almost 10 years ago | |||
| mathew | "following up on our discussion about trying to calibrate the pump without the flow meter-- could we calibrate the pump at our office, and then have..." | Read more » | almost 10 years ago | |||
| danbeavers | "Oh, I was making assumptions. I had not seen a pump that was set up to have 2 different attach points. So never mind about my comment! " | Read more » | almost 10 years ago | |||
| nshapiro | "@danbeavers were you using the whisper pump or another pump? I think the whisper pump can handle one pump and one vacuum if need be " | Read more » | almost 10 years ago | |||
| danbeavers | "On reversing the aquarium pump: Be sure and reverse both diaphragms! " | Read more » | almost 10 years ago | |||
| sadler | "sorry for bring this post back from the dead but i want to build it :) so any suggestions for what material i should make the spars out of? " | Read more » | almost 10 years ago | |||
| warren | "Hi, Nick - I'm working on some sketches of the kit; do you have any photos of the entire thing, just a bit more zoomed out? Thanks! " | Read more » | almost 10 years ago | |||
| mathew | "I just bought the air pump components and a graduated cylinder to try and compare @davidmack's cheapo air meter... can't wait. I'm going to try us..." | Read more » | almost 10 years ago | |||
| straylight | "Good points and I understand how you feel, coming at his from a chemistry teachers viewpoint myself. I guess it depends on what experiments and dem..." | Read more » | about 10 years ago | |||
| srpratt | "I'm new to the cellphone-becomes-a-photospec phenomenon, as I was told about this by a colleague. As an AP Chem teacher, I'm looking for hacks to ..." | Read more » | about 10 years ago | |||
| nshapiro | "I think so. Those tubes require one pump on the Draeger Tube proprietary pump. So if one were to rent their proprietary pump for a single day and a..." | Read more » | over 10 years ago |