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I had a similar one. There are screws in the feet. Open them to see the 2 AA batteries. If it still don't work the light bulb is probably dead.
In any case its much better to use an external light source. I used a 60 watt bulb in an adjustable lamp.
Compound microscopes can be
found in most biology and science classrooms. They are electrically
operated and use light to enhance the image of a cell. They will have
multiple lenses for viewing.
Dissecting Microscope
Dissecting microscopes are also
known as stereo microscopes. They have low magnification and are also
light powered. These microscopes can view objects larger than what a
compound microscope is able to handle, in three dimensions.
SEM
A Scanning Electron Microscope
uses electrons instead of light to create an image. These microscopes
produce three-dimensional images with high resolution and magnification.
They also have a larger depth of focus.
TEM
Transmission Electron
Microscopes use electrons instead of light to create an image. The
material prepared must be very thin. The beams of electrons that pass
through it give the viewer high magnification and resolution. These give
two-dimensional images.
You will need to focus in on the slide. There should be 2 1" diameter knobs on either side of the stand, and just to the rear. Those knobs control the height of the stage (where you slide sits). Slowly raise or lower while looking into the eyepiece. At some point something should be see, if the microscope is working properly.
Sometimes it is easiest to start with the lowest magnification. On the outside of the objective (little lenses hanging down that can be rotated) there should be some numbers written on them (usually 4, 10, 40). Those numbers reference your magnification. If you multiply that number by the eyepiece (10) magnification, you will get your total magnification, so start out with your 4x. It will give you the largest field of view, so it is great for finding whatever it is that you are looking for on your slide. It is also the easiest one to get focused. The higher you go in magnification, the smaller the field of view, thereby the more difficult it is focus in on your sample.
There are a couple of standard sizes for eyepieces, 1 and 1/4 inches (outside diameter of the eyepiece barrel) being the most common. Measure the inside diameter of your eyepiece tube. You can find lots of them on eBay or Amazon if you search on "eyepiece 1.25". The other number quoted will be the focal length. Shorter focal lengths give greater magnification.
First, a scope of this grade will not be completely in focus as you move from one magnification to the next. But it should be close enough that you do not loose your point of interest.
Be sure you are not pressing down on the stage specimen platform as you change magnifications. It is very sensitive to pressure.
Also, be sure that the coarse focus tension is tight enough that the platform is not drifting down imperceptibly as switch magnifications. Look through the scope and watch if the image goes out of focus while you are watching it. If so, you have what is called "stage drift".
This is corrected by tightening the tension on the coarse focus knob.
The tension adjustment is on the coase focus shaft. It looks like a chrome ring with about 3 holes in it. There should have been a strange looking tool that came with your scope. It is used to adjust the tension. If your specimen is "drifting" out of focus, simply tighten the tension ring a little bit at a time until the specimen no longer goes out of focus. Do not get it so tight that it is not easy to operate the coarse focus knob.
Hello--I understand that you need at least 600x to view bacteria and some say 1500+ so 40x doesn't seem to be in the right mag. area at all--not sure this helps much.You could purchase a 100x obj. and 10/15x eyepieces but will probably be into oil immersion for the obj.Possibly a 20x eyepiece + a 60x obj will give you a degree of definition.I use a SEBEN Bino with this combi and it gives a small view but not good.kind regards martin r
Try Ebay--may have to buy the micro aswell but it won't cost much,have you tried the Tasco website in case a free d'load is avail?-kind regards martin r
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