Through a drop of water. Drawing, description

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Through a drop of water. Children's Science Lab

Children's Science Lab

There are no lenses in our homemade microscope. Its entire optical system is a drop of water in a hole pierced by a needle in a flat tin 2. Directly under the tin is an object table 8 with glass 7, on which the object of study is placed. The light reflected from the mirror 6 passes through the collector 4, is collected in a beam and hits the object. By approaching or moving the glass slide away from the drop using the smooth adjustment roller 9 and the coarse adjustment lever 10, it is possible to adjust the magnification and sharpness of the image within certain limits.

(click to enlarge)

Let's start with the manufacture of the collector. It is made from a sleeve for a hunting rifle of any caliber. The sleeve is cut so that the length of the tube is about 30 mm. In accordance with the caliber of the sleeve, two circles are cut out of cardboard. A hole is burned in the center of one of them with a red-hot needle. The hole in the center of the other should be larger, it can be burned with a red-hot nail. Mugs, smeared on the sides with BF-2 glue, are inserted from both sides into the tube, forming the bottoms of the cylinder. When assembling, the collector is attached to the rack 3 with a tin clamp 5. With a smaller hole it faces the drop, with a larger one - to the mirror.

The fragment of the mirror needs to be trimmed and inserted into frame 12 made of tin. This frame rotates in rack 13.

The brightness of the illumination of the slide can be adjusted by turning the mirror around the stud axis.

The smooth adjustment roller is rolled up from a strip of thick paper smeared with BF-2 glue. It should walk on the coarse adjustment lever 10 with little friction.

The coarse adjustment lever is pivotally connected to the smaller rack 3. To do this, a groove is cut in the upper part of this rack for the thickness of the lever and a through hole is drilled for the axle. The axis can be a screw, a nail, a metal bar. The object table 8 is connected to the lever with a small screw.

When assembling the microscope, try to ensure that the holes punched in the eyepiece holder are exactly opposite the holes in the manifold. For this, the following assembly order is recommended.

Through a drop of water

A collector is attached to the rack 3 perpendicular to its longitudinal axis with a clamp. The racks are fixed on the base 1. A reflector is mounted under the collector at a distance of 50 mm from the longitudinal axis of the rack 3.

In a tin circle with a radius of 50 mm, a circle is drawn with a compass. Then the circle is reinforced with a small screw on the stand so that the lined surface is facing the collector.

Having inserted a long needle into the collector for a while, we check the accuracy of its hit on the circle drawn by the compass. If necessary, the radius of this circle is changed.

Then the circle is removed from the rack. Holes of different diameters are carefully punched in it.

Using a screw, we strengthen the tin circle on the rack. The holder should turn with little friction. Finally, the remaining parts are strengthened and drops are applied.

A piece of fishing line is lowered into a glass of water, mashed with fingers to reduce wettability. Then the fishing line is taken out - a tiny drop of water trembles at its end. Gently drop a drop into one of the holes on the tin mug and the microscope is ready to go.

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