dogsafire

What function does the bell ring on an oboe serve?

I have seen performances in which it appears that some oboe players have removed their instrument's bell ring. Why would they do that?

My computer tells me that it is a Surface Pro i7 Model 1796

Is this a Surface Pro 5, a Surface Pro 6, or what?

I have cracked my computer's screen and need to buy a replacement, but I don't know which display to buy

I'm new to milling. I want to mill some brass, which should be very easy, but at 2000 sfm, and a 1/2" mill, I get over 15000 rpm. My machine can't get close to that. I'm using manual feed too.

What is the down side of milling material at a speed considerably slower than the optimum removal rate?

Anhydrite is a very soft rock, yet it drills much slower than carbonates. I have seen 15 min/ft drill times.It seems like the drill bits should just chew right through it, but clearly they don't. Why?

I have a large glass vacuum desiccator that has a 24/29 ground glass fitting at the top. I would like to put a vacuum gauge on the desiccator side of the vacuum shutoff valve.

How is a gauge stem connected to the glassware? I'm not sure what sort of hardware I'm looking for. Is some sort of threaded connection available? Is it done with an o-ring seal? How can I connect a gauge into my system?

Not actually participating in the act of rebellion or war, just promoting and inciting it.

The Sedition Act covers some. What else is there?

I want to cast a long, thin part in hard urethane (80D) for prototyping. The part will be about 33" long, about 5" wide and about 1/2" thick and is a long radius arc of a circle, as though you have cut a sector from a disc.

It is intended that the upper and lower surfaces of the part will be rolling surfaces. The lower surface is supported atop some transfer ball casters and a second piece can be rolled along the upper surface. Therefore, I want the upper and lower surfaces to pretty flat and straight.

1) Is molding an appropriate method for what I want or should I be looking at a different process?

2) Would a silicone mold, with a support structure to maintain rigidity, be sufficient as a mold? How do you suggest maintaining straightness and flatness?

3) How do I fill the mold?

Do I create a two part mold, tilt it a bit and fill by injecting from the lowest point? Is there a way to fill the open mold and lay the second portion in place without making a giant mess? How would you actually make this part?

I do have vacuum equipment suitable for de-airing. Any tips relating to mold release, etc. would be appreciated

Thanks

I had been using my phone earlier in the day. Battery was getting low (but not seriously low) so I plugged it in. A few hours later, I picked up my phone to text a friend and there is an Activation Lock on my phone, and it wants me to enter my iCloud login credentials.

To me this looks like a classic Trojan. But could it just be a glitch in the system? Or could it be legitimate? What triggers an Activation Lock? I think the first message I read might have said something about an attempt to use Find My iPhone

I need to go to Mac Terminal to get something done. The command refers to an application file name that includes both a space and a decimal. The app file name is

FireCapture v2.6.app

My Unix experience has a lot of dust on it. I can make the command succeed if I simply rename the app to FireCapture, but I would prefer to keep the version information. Will wrapping the app name in quotes work like this?

command "FireCapture v2.6.app"

Is there a better way to do this?

Why are numerical values in monochrome TIFF files different from those in RGB TIFF files?

I'm not trolling here. I know that they don't like Snopes because, well the Mikkelsons are from California, so they'er obviously liberals.

So, if Snopes is unacceptable and I want to let one of my conservative friends know that no one is putting HIV infected needles in gas pump handles, that it's an old scare going back to when there were pay phones and people supposedly put HIV infected needles in the coin returns, who can I send them to that they will actually trust the source.

I have a Sony Alpha7R Mk2 DSLR which produces 42 Mpix images. Given that only one in 4 pixels is going to see anything in a Ha image, that cuts my resolution by a factor of 4 resulting in effectively a 10 Mpix image. The highest resolution I see on the monochrome cameras is about 5 Mpix. Am I better off using 1/4 of the pixels of a Bayer filtered sensor that has 42 Mpix or does a lower pixel count monochrome camera still have other advantages?

I am interested in getting an entry level telescope with the primary goals of lunar and planetary viewing (as opposed to deep space objects). I have a good bit of experience with photography and microscopy. The Celestron Advanced VX 8" EdgeHD appears to be about the level that I am looking for with a decent, but not huge aperture, Go To system, and reasonable portability.

I have both Nikon and Sony full frame cameras for image capture.

Would you recommend a different scope (somewhere near this price point)?

What accessories do you consider indispensible?

I plan to use the scope to observe the eclipse. Aside from the necessary neutral density filter and suitable eye protection for myself, is there anything else I would need?

For many years I have been interested in astronomy, but made a decision a good while back to go the direction of microscopy rather than getting a telescope. With the upcoming total eclipse, I have a new impetus to my astronomy urges. But I don't want to buy a dedicated solar scope, at least I don't think so. After the eclipse, I would like to use the scope for more traditional stuff - moon, planets, nebulae...

I am at the point in life where I can afford some decent optics. A four figure price tag isn't too much, though I need to question how much I'll really be using it if we start talking 5 figures.

What sort of system should I be looking at? Am I seriously hobbling my eclipse viewing by relying on add-on filters for a traditional scope? Is an internal doppler etalon essential for a good hydrogen alpha image (this feature seems to be emphasized in the dedicated solar scopes)? What add-on filters would be most useful for the eclipse?

It's probably another discussion altogether, but do you have any recommendations for automated trackers to accommodate for Earth rotation?

I have an old picture of my father's artillery unit. One shows a soldier about to fire the weapon and it's obvious that he is yelling something. OK, so maybe it's "Fire!" But is that what someone in the military would actually say?

What is the name of the cord that is pulled to fire a howitzer?

What would a soldier yell just before pulling it?