[Use of astronomical Telescope] How to use the astronomical Telescope to use the correct use step and guide

1. Install a astronomical Telescope according to the instructions.

2. Regarding the focus of the Telescope and the calibration of the cross -line mirror

Loose two fastening screws on the eyepiece.Take out the low -duty mirror and put it on the eyepiece to pick up the cylinder, and then tighten the screw.The adjustment of the focusing knob can obtain a fuzzy image of an object A in the distance, and then slowly adjust the coke knob back and forth until the object image is clear.The Telescope has accurately adjusted the focal length, and now it can be observed with a star -seeking mirror.If the astrology mirror is not at the focal length, turn the eye mirror until a clear scene appears.When the object of object A you see on the Telescope is not in the center of the star mirrors, according to the following method: tighten or release the screw on the star -seeking mirror support, so that the star -seeking mirror up and down, left and right workers, left and right workers, left and right workers, left and right workMove obliquely.When the object of the object A appears in the center of the cross line, your star -seeking mirror is ready, and finally the three screws are tightened.Then replace the low -power mirror with a high -power mirror and repeat the above program.If the center of the image observed under the maximum mirror and the cross -line center of the star -seeking mirror, your star -seeking mirror is adjusted.Now you can quickly find the celestial body you want to observe.In extremely special circumstances, star -seeking mirrors may need to be adjusted.

3. precautions

A. Under any circumstances, first look for objects with a star -seeking mirror, because the perspective of the star -seeking mirror is greater, which can greatly accelerate your coarse tone.

B. Under normal circumstances, first install a low multiplier mirror to gradually increase the multiple you need, and you need to make the necessary focus when you change the mirror.

C. Don't be troubled by the upper and lower, left and right images that you see, this is a normal situation for astronomical Telescopes.

4. Effective observation notice

If the Telescope gets outdoors for the first time in air with lower indoor temperature, it must be used for a few minutes-because the temperature difference will make the lens blindfold.This phenomenon will disappear after 15-20 minutes.If your eyelids or fingers touch the eyepiece, the cloth that can't afford the hair will be gently wiped to see the mirror to prevent blurred images.It takes about 30 minutes to enlarge your pupils to adapt to darkness, so use a Telescope at night. After half an hour, you can see a much dark celestial body.

5. Various factors that may affect the observation results

Observation results are not all taken in the optical properties of the Telescope, and many factors also affect the quality of the image.

A. The atmosphere surrounded by the earth is always moving. This kind of atmospheric movement and rotation will cause bad images at a high rate. Perhaps after a few nights, the observation will improve.

B. The heat on the surface of the earth will also cause the fluctuations of the air and make the image distort and deform, resulting in poor observation.

C. The observation angle of the Telescope and the star and horizon has a great impact on the observation effect: if the star body is close to the horizon, the goal will be blurred.

D. Pollution of light sources: use your Telescope (such as under street lights, under room Lights, etc.) as much as possible in a light -free environment, high -mortar astronomical Telescope is very sensitive to light.Even more obvious, it seems that many stars will disappear over the urban area.

E. Moonlight may also be another factor that affects observation. The dazzling full moon or bright moonlight will blur the nearby stars or planets, and the moon itself is the best observation state between darkness and Tianming.

f. Try to avoid observation from opening the window (let alone observation of closed windows), especially in the cold season, the indoor and outer temperature difference can be worse, which will make the observation quality worst.

G. The cloud layer accumulated in the sky cannot penetrate the observation, but this cloud will often move.

H, star flashes are caused by air convection, which will also affect observation.

Remember, in any case, do not directly observe the sun through a star -seeking mirror or main lens barrel, otherwise it will seriously damage your eyes.

childraincoatMarket chaos

Frog Raincoats, rabbit Raincoats, rice mouse Raincoats, sponge baby Raincoats ... Most of the children's Raincoats sold in the market are bright and full of patterns, and a risk monitoring report shows that at least 50 % of children's Raincoats are adjacent.The content of phenyl acid ester exceeds the standard, and long -term contact may affect the child's reproductive system.People in the industry suggest that it is best to buy pure plastic for children without printing any patterns.

1. The color is bright and cheap

In a kindergarten, if you catch up with the rain when you leave the Park, you will "jump" from the kindergarten one by one to various "small animals" -have frogs, rabbits, tigers, etc.raincoat.This kind of raincoat is full of patterns of small animals, such as frog Raincoats, that is, there are long heads, back, and sewing on the back, and even the buttons.The parents of the children said that these Raincoats are basically purchased from the nearby market, and the price is not expensive, basically one dollar of 20 or 30 yuan.

Children's Raincoats sold in the market are basically colorful patterns.A salesperson said that such Raincoats are full of cartoon images. It is best to sell. Parents and children like them. They can wholesale thousands of pieces every day.Although children's Raincoats are all promoting thickening, insulation, breathable, etc., they are all containing coating materials. It is difficult to find pure plastic products.

2. Excessive content of toxic substances

The reporter searched on the Internet and found that children's Raincoats with a price of less than 15 yuan are all disposable. This raincoat is mostly VPC material, pure color, without patterns.In the monitoring of a quality and safety risk monitoring organized by relevant departments, such Raincoats are not much problems.

Through monitoring of 30 batches of samples, the content of demental amphenolate in 15 batches of children's raincoat exceeds the reference value range, with a proportion of 50%.Industry insiders explained that phthalate is a type of plasticizer. If a child is worn naked for a long time or puts accessories into his mouth, long -term large doses of contact will lead to the dissolving volume of diopenate.Exceeding the level of safety, it will endanger children's liver and kidneys, and may also damage the development of reproductive systems and cause precocious puberty.In addition, the lead and cadmium content of some children's Raincoats are beyond the reference value range.As children are in the growth stage of growth, their body resistance is lower than adults, and they are vulnerable to the influence and violation of various types of harmful substances.

How to choose children's raincoat

1,raincoat material

General children's raincoat materials are PVC. The editor thinks that this is enough, because the children's Raincoats are only temporarily worn. As long as they love it, the Raincoats of this material will generally not break.If you want to buy some, then buy PVC Gamon, which is more strong.For those plastic cloth Raincoats, you can't wear it only a few times, and you should not buy it for your children.

2. Rainwear size

The size of the raincoat should be selected well. When buying, Xiaobian finds that the raincoat suitable for the age group is actually smaller. For example, the S number is suitable for children aged 3--5 years old, but sometimes it is thick or bigger.The clothes and the schoolbag should be carried, so that the raincoat of the size is small. You should buy the largest one and you can wear it for a few years.The larger raincoat can also cover the child's legs. It is more appropriate to buy raind pants alone. Of course, you can't buy too much.

3. Smell the taste of the raincoat

Some inferior Raincoats, before putting it beside the nose, emit some pungent taste, such Raincoats cannot be bought for children.They are made of inferior plastic, so they still choose more and find those who have less tastes and safer.Of course, plastic products will inevitably taste. After buying, it will be more ventilated for a while.

4. Select less coating printing raincoat

Parents should try to avoid choosing raincoat containing large -area coatings and patterns.Because these Raincoats such as coating, printing, and film, are likely to contain toxic and harmful chemicals such as phthalate, lead, cadmium, and chlorohylene monomer.Among the various colors such as fluorescent green, princess powder, marine blue, lemon yellow, etc., you should also choose plain and not bright. It is best to not add the solid color of the paint.

5. The contents of children's Raincoats need to be complete

Consumers should pay attention to whether the contents of children's Raincoats are complete. Specific information including model specifications, materials, factory names, product names, product standard numbers and other information. Try not to buy products without logo or incomplete identification information to protect themselves in response to themselves.Some rights.

6. Buy a raincoat with a schoolbag space in the back

Children generally need to memorize schoolbags, like children in kindergarten like to memorize schoolbags, whether useful and useless.Therefore, when buying a children's raincoat, you should buy more space to place a schoolbag.So don't be afraid to wet the child's schoolbag.In addition, to see if there are pockets, it is more practical to have pockets, and children will like it even more.

7. Pay attention to see if there is a damaged place for the raincoat

When buying a raincoat, you should shake the raincoat to see if there is a damaged place. If you have a crack, do not buy it. Some of the sutures are crooked.In addition, we must focus on whether the sewing is dense and carefully observe whether there is a line.In addition, do not let your child's Skin contact the raincoat directly. Wear a dress first.

8. It is best to let your child try on

In order to make the raincoat more fit, parents should take their children to try on it, and buy a little bigger.It doesn't matter if the sleeves are longer, just pull up a piece of Sleeve.The lower body is a little bit covering the legs, but there are some raincoat design problems. If the shoulders are too wide, the child will be very loose and uncomfortable, so it is best to try it on.

9. Try to choose the brand as much as possible. It is better to buy in large supermarkets or malls

When buying a children's raincoat, you still choose a brand. The quality is relatively good, and the price is actually not much different.And if you have any problems, you can exchange it at any time. If you buy it on the stall, it is difficult to return and exchange.Many people like to shop online. Although they are cheap and convenient, the quality is uneven. It is still many disadvantages that they cannot touch it in person.

Disclaimer: The above content is derived from the provision of the program system index or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;

1. How do you think of the compass?

The one -end of the compass of the compass will point to the south with the white end of the white, and the red or darker end will point to the north; that is, the direction of the n indication is the south, and the direction of the S indicator is the north.If you use an electronic compass such as a mobile phone, you need to calibrate first, stay away from the magnetic field, and then the red needle can determine the direction.

Guide needle, in ancient times, was called Sinan. The main component was a magnetic needle installed on the axis. The magnetic needle could rotate freely under the action of a natural magnetic field and keep it on the direction of the tangent of the magnetic meridian.One performance can be distinguished.

How to use the positioning of the compass

1. First hold the compass with your hands, turn around in place, and stop to the red pointer with the north.When the red pointer and the north are combined, the northeast and northwest of the compass are the actual southeast and northwest.

2. Put the compass flat, so that the pointer can rotate freely, rotate the shell of the compass needle, so that the finger is targeted at the scale of the north and south directions, and maintains the scale of the finger targeting the north and south directions.The point of the guideline is a straight line with the direction scales you want to find, which is the direction you are looking for.

Third, the basic knowledge of the use of compass

1. The compass can help you determine what direction faces the face; if you think of it as a dial, then the north direction is the direction of 12 o'clock, the east direction is 3 o'clock, the south direction is 6 o'clock, and the west direction is 9 o'clock.

2. In addition, it can rotate a whole circle like the pointer of the clock. The difference is that it can turn it upside down.

3. This rotating pointer always points to the north, and the end of the north is usually made into the shape of the arrow, or red.

4. When using, you should flatten the compass, don't let the pointer shake.

5. Let the compass away from metal objects.scissors, flashlights, and even keys will interfere with the accuracy of the guidelines pointing.

1. How much is the price of a suspension?

For many friends who like to Camping in the wild, the Hammock is a must -have as a very easy to carry. The Outdoor suspension machine is embedded on the tree and lying on the Hammock to bathe the sun.You can also hang a Hammock, so how much is the suspension?

There are many suspension products on the market, and the price is high and low. Generally, it is mainly affected by factors such as material, size, brand, and purchase channels. The market price is between 30, 40 yuan and two hundred yuan.

Note:The above price source network is for reference only.For more suspension price reference & gt; & gt;

2. Where can I buy a suspender

The Hammock is a type of Outdoor supplies. It is generally available in outdoor products stores. outdoor products areas for large shopping malls and supermarkets can sometimes buy Outdoor hammocks. If you buy offline, you may not be so complete.Consider buying online through major e -commerce platforms.

3. How to choose Outdoor hammocks

For some Outdoor enthusiasts, the Hammock is the ultimate entertainment relaxation space. Some professional Camping players will also sleep in a suspension under the starry sky. When buying Outdoor hammocks, the main attention will be considered as follows:

1. Size

The main differences here are single hammocks and double hammocks. Generally, it is recommended to choose a double Hammock. Most people choose the two -person space to be comfortable, not necessarily because they really plan to lie with others.

2, fabric

According to different scenarios and needs, the common Hammock fabrics on the market are: mesh, cotton/canvas, polyester fiber/nylon fiber, and the price is different according to material differences.

3. accessories

The Hammock needs to match the suspension system (strap, buckle, etc.); other choices that are more popular in the market include cold -proof pads, railbars and insect -proof nets.

4. Hanging Tent and sleep system

The suspension Tent usually includes all accessories required for overnight suspension and sleeping all night sleep.You can also build your own system. Starting from a suspension, you can gradually add accessories to create your own suspension camping equipment system.

5. Final use

For Backpack travel, the weight of the suspension is the key consideration; for Camping and party time, the comfort and durability of the Hammock are more important.

Standard for Ship life jackets

The new standard Ship's life jacket is designed and manufactured in accordance with the requirements of IMO MSC.200 (80), MSC.207 (81), and the national GB4303-2008 standard. The buoyancy is greater than 155N, which meets personally weighing 140kg and 1750mm bust.Speak.

The Ship's life jacket is equipped with a throwing floating lace, which can be worn on the life clothes or life jacket worn by another person in the water.In the life raft.The specification was implemented on July 1, 2010, and the life jacket was suitable for adults.

Shipping life jacket classification

1. Ship Lifeline is divided into adult life jackets and children's life jackets depending on the applicable objects.

2. Adult life jackets are divided into ordinary life jackets, job life jackets and qi -style life jackets according to different structures.

Standard performance requirements for Ship life jackets

1. The life jacket can be completely surrounded by the fire for 2 seconds, not burning or continuing melting.

2. After being immersed in fresh water for 24 hours, the buoyancy of life jackets is not more than 5 %.

3. Within 5 seconds, the person who lost consciousness can be transformed from any posture in the water to no less than 120 mm.

4. Those who can make at least 75 % of them who are completely unfamiliar with life jackets can wear life jackets correctly within 1 minute without help, guidance or pre -demonstration.

5. Make the wearer jump into the water from the height of at least 45 m, and will not be injured, and the life jacket is not damaged.

6. Each adult life jacket can make the staff wearing a short distance swimming and board the lifeboat.

7. All children's life jackets should indicate the words "Child".

8. Each life clothing has a whip flute tied to a thin rope.

Ship Lifeline price

Both the staff on board and the tourists who board the boat need to use the life jacket proficiently. It is best to wear a life jacket at the process of the Ship.The expensive, the price of life jackets ranges from the standard tens of yuan to the high configuration of hundreds of yuan. Generally, the price of 75 yuan to 90 yuan can be purchased nearly costly cost-effective life jackets.(For reference only)

Disclaimer: The above method stems from the index of the program system or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. It proves that it is valid. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;