Microscopes

If you are willing to do a little research, may I suggest that you look up stereos made by GPX in Consumer Reports, and see what they think as well as what other people think of the, GPX, brand in general.

Either "a spectrum" or "a light source" (usually), depending on exactly what you mean.

The "usually" is because there are some kinds of instruments called spectroscopes that use a different principle. One example would be a "mass spectroscope".

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the objective lens has the power of that lens inscribed on it

The first practical automobile was invented by Karl Benz in Germany 1885.

You can try Tego chemie's "Foamex 810 ". Actualy it is not recommended for epoxy systems, but it works-----

This iris diaphragm of a microscope contains the amount of light that can enter through to the specimen. If the condenser iris diaphragm is open, the image will be bright; if it is closed, it will be dim.

The hydrophone was developed first. It was around back in Da Vinci's time, and the first recorded use dates from about 1490. Stick the large end of a "horn" of some kind in the water and listen to the little end to see what you can hear. That's a hydrophone. Sonar came along later, like in the early 1900's. It was being developed at the time electronics was advancing, and it is with the application of modern electronics that we can make the most effective use of this remarkable imaging tool. A link is provided to the Wikipedia article on sonar, and the "History" part of the article is short and easy to read.

Anthony van Leeuwenhoek was an unlikely scientist. A tradesman of Delft, Holland, he came from a family of tradesmen, had no fortune, received no higher education or university degrees, and knew no languages other than his native Dutch. This would have been enough to exclude him from the scientific community of his time completely. Yet with skill, diligence, an endless curiosity, and an open mind free of the scientific dogma of his day, Leeuwenhoek succeeded in making some of the most important discoveries in the history of biology. It was he who discoveredbacteria, free-living and parasitic microscopicprotists, sperm cells, blood cells, microscopic nematodes and rotifers, and much more. His researches, which were widely circulated, opened up an entire world of microscopic life to the awareness of scientists. Leeuwenhoek was born in Delft on October 24, 1632. (His last name, incidentally, often is quite troublesome to non-Dutch speakers: "layu-wen-hook" is a passable English approximation.) His father was a basket-maker, while his mother's family were brewers. Antony was educated as a child in a school in the town of Warmond, then lived with his uncle at Benthuizen; in 1648 he was apprenticed in a linen-draper's shop. Around 1654 he returned to Delft, where he spent the rest of his life. He set himself up in business as a draper (a fabric merchant); he is also known to have worked as a surveyor, a wine assayer, and as a minor city official. In 1676 he served as the trustee of the estate of the deceased and bankrupt Jan Vermeer, the famous painter, who had had been born in the same year as Leeuwenhoek and is thought to have been a friend of his. And at some time before 1668, Antony van Leeuwenhoek learned to grind lenses, made simple microscopes, and began observing with them. He seems to have been inspired to take up microscopy by having seen a copy of Robert hooke's illustrated book Micrographia, which depicted Hooke's own observations with the microscope and was very popular.

Because it is too expensive to mishandle and replace it.

Microscopes are used both in classrooms and in making important evaluations in medical laboratories and other microtechnologies. The different types of microscopes are designed for these different uses, and therefore will vary based on their resolution, magnification, depth of field, field of view, illumination method, degree of automation, and type of image they produce. There are essentially three categories of microscopes: electron, confocal, and compound. Electron microscopes are extremely sophisticated types of magnification devices. These are used in archaeology, medicine, and geology to look at surfaces and layers of objecs such as organs and rocks. Instead of using light, these devices point a stream of electrons at the specimen and attached computers analyze how the electrons are scattered by the material. The specimen must be suspended within a vacuum chamber. With transmission electron microscopes, a scientist gets a view of 2-D slices of the object at different depths. Of course, with such powerful instruments, both the degree of magnification and the resolution, or sharpness of the image, are very high. Scanning electron microscopes are slightly different in that they scan a gold-plated specimen to give a 3-D view of the surface of an object. This view is in black and white, yet gives an amazing picture of, for example, the minute hills and valleys of a dinosaur bone. A confocal microscope is a step down from the previous types. It uses a laser beam to illuminate a specimen whose image is then digitally enhanced for viewing on a computer monitor. The specimen is often dyed a bright color so the laser gives a more contrasting image. It is mounted on a glass slide just like in high school biology. Confocal microscopes are controlled automatically, and motorized mirrors help with auto-focus. Finally, there are the simplest types of microscopes found in classrooms across the world: compound microscopes. These are entirely operated by hand and use the ordinary ambient light from the sun or a light bulb to illuminate the specimen. Whatever you want to look at is mounted between two glass slides and clipped beneath the main lens. You use a dial to focus the image. These tools use a simple series of magnifying lenses and mirrors to bring the image up to an eyepiece, much like a telescope. Compound microscopes are mostly used in biology. They give a 2-D slice of an object, yet can attain a high enough magnification to see parts of eukaryotic cells, a hair strand, or pond scum. Unfortunately, they do not have excellent resolution, so the image may be blurry. On the other hand, stereoscopic microscopes, as the name implies, provide a 3-D picture of bisected items, like muscle tissue or an organ. In this case, magnification is poor, so you can't make out separate cells, but resolution is much improved.

Hi, There are more different type refrigerants on the books than you would ever even believe. A few oldies being sulfer,anhydrous ammonia,water itself has been used. You have had your Refrigerant designation numbers assigned to tons of them. It is really interesting to see what all you'll track down that has been used or is in use. If you are really interested, I advice you to take an E.P.A. Refrigerant Licensing Course. E.P.A. ( Envioronmental Protection Agency ),,, the guys that care bout our planet and what happens to it. You'll probably be glad u did! I know I was. I've even done update versions just to keep up with the new angles and rule modifications and such. Tons has changed since the first testing was done for the handling and dispensing and storage of refrigerants. There are also rules for safe shipping of it which also must meet O.S.H.A. standards. Hope you'll do this, Have fun!!! Think Green,,,, Jimiwane

I am not sure what model my toshiba PC is, but this will probably work fo yours. hold Dow the FN key ( bottom left on keyboard) while pressing F7 to make the screen brighter, F6 to make it dimmer.

hope this helps,

A random PC geek

Not much info in the question, but try this. IF the Model 60 is a .22 long rifle, and a semi-auto, you very well might run into failures to feed or eject of you use sub-sonic, or standard velocity, ammunition. Most semi-autos are set up to work with the high velocity, or supersonic, .22 ammunition. Standard velocity ammo is often manufactured as high quality target rounds. The reason for this is that, since the bullet does not exceed the speed of sound, it won't make a sonic boom..or crack, in this case. The theory is that breaking the sound barrier makes a .22 bullet a little less accurate. For small game hunting and most other uses, the high velocity round is plenty accurate, and tends to put small game down a lot more reliably and humanely, especially if hollow point bullets are used. Since the subsonic rounds are a little slower because they're a little less powerful, they may not alway generate enough pressure to activate a common blowback action semi-auto rifle. If you try high velocity ammo and it works fine, you have the answer to your question.

*** Good info there, also try this: Clean your feed ramp. Subsonic ammunition is usually very soft, and can foul the entire action. Ammunition such as Aguila and others that offer very low velocity subsonics don't provide enough force to properly cycle the action. If you're getting a lot of cases that 'stovepipe' where the spent case is not fully ejected from the action, you're probably using a subsonic that's too slow. Try Remington or CCI subsonics. They both function nicely in all my .22 semiautos, including my venerable old Mod 60. ______________________________ I'll also add that in .22lr bulk packs, avoid Remington Golden like the Swine Flu. They are inconsistant at best...maddening with squibs & short-powder on a regular basis. Sub-sonics tend to be spotty in performance with semi-auto's that use standard blowback actions.

The coarse adjustment knob is used to make large adjustments to the focus of the microscope, bringing the specimen into view. The fine adjustment knob is used for precise focusing by making small adjustments to the sharpness of the image. The combination of both knobs allows for clear and accurate visualization of the specimen.

When changing from low power to oil immersion high power, the field of view decreases. This is because oil immersion lenses have a higher magnification power, which allows for a more detailed view of the specimen but with a narrower field of view. This increase in magnification results in a smaller area of the specimen being visible at one time.

Direct sunlight can cause fading, warping, or damage to certain materials such as fabrics, wood, or artwork. To prevent this, consider using curtains, blinds, or UV-blocking window film to reduce exposure to sunlight.

The compound microscope has three main parts, The three main parts of a microscope includes the illuminating parts, the magnifying parts, and the mechanical parts.

ewan

Microscopes were what lead to the discovery of cells!

The inventor of the microscope is generally attributed to Zacharias Janssen and his father, Hans Janssen, from the Netherlands in the late 16th century. They were spectacle makers who created the first compound microscope.

The electron microscope because Electron microscopes can obtain pictures of extremely small objects-- much smaller than those that can be seen with light microscopes.