Lin Gao Qiming

Chapter 1311 Glass dry plate
Ge Xinxin put on straw slippers and took off her coat.Stepping on the wooden floor relieved her sore ankles.She went to the bathroom to brush her teeth and wash her face, set the alarm clock for 0:30, and then took a blanket to cover her body in a rattan rocking chair and fell asleep.

The old-fashioned mechanical alarm clock brought by "Bing..." often needs to be checked. The only advantage is that the sound is loud enough to wake up an elephant.Ge Xinxin tidied her clothes a little, washed her face with cold water, and returned to the laboratory.Only the red flashlight was left again, she took out the silver bromide gelatin that had just been put into the box, poured off the water on the surface first, and then wrapped some gelatin with a white cloth that had been boiled in boiling water and dried, like milking milk on a cake Squeeze all the gelatin into a line into a large beaker with 3L of distilled water.Shake the beaker gently, pour out the water in the beaker after a few minutes, and then add 2L of distilled water.After repeating this 5 times, pour out the water.Heat the gelatin again to melt, stir for 10 minutes, let it stand for a while, and pour off the water on the surface.

After achieving this step, Ge Xinxin let out a long breath.This is the most tiring of all steps, and it's not too difficult once this step is done.Take out a simple coating device made by yourself.In fact, it is two parallel guide rails with a distance of 30cm and a glass strip that has been polished to prevent scratches.Ge Xinxin carefully pinched the edge with her hands, took out a 15cm×20cm glass piece that had been cut long ago, washed ten times with distilled water, and then soaked in ethanol for a day, placed it in the middle of the guide rail and fixed it.

These glass pieces were specially ordered by her in the name of the laboratory a few days ago, and they were just delivered a few days ago.The glass factory has a workshop dedicated to making matching glass instruments and consumables for the laboratory to meet the laboratory's requirements for high precision and high purity.These glass sheets are manufactured with the highest possible uniformity.However, Ge Xinxin was not at ease about the quality control of the glass factory. She asked a trainee experimenter to use a micrometer to measure the thickness of the glass one by one.

A total of 43 glass plates were sent, and the trainee experimenters carefully measured them one by one with great patience, and selected [-] pieces for spare according to the standard given by Ge Xinxin.

The thickness errors of these 43 glass plates are all within the acceptable range.But she only plans to make 20 slices today.She glanced at the spirit level on the table, and after confirming that the current table was level, she dug out a spoonful of gelatin and poured it evenly on one side of the glass sheet, and spread the gelatin evenly along the guide rail with a glass strip.In this way, she made 20 glass slides coated with silver bromide gelatin.Carefully put the bottom of the slotted wooden box filled with glass pieces into the desiccant and cover it, and put it into the cabinet together with the box containing the beaker of gelatin - it was also measured with a level beforehand and adjusted to a horizontal state.

She made a photographic glass dry plate. Although the flatness of the glass strip is limited, as long as the glass plate is qualified, the problem is not big. The glass dry plate emulsion is not like the micron level on the film, generally 0.5-1 mm, there is a little error problem. big.On the contrary, it must be kept at an absolute level when waiting for drying after application. Although the fluidity of gelatin is not good, once there is an angle of inclination, it will still cause flow, and problems will occur immediately.

Ge Xinxin finally shook her sore arm, turned on the light, tidied up and left the laboratory.At this time, the sky in the east had already started to turn pale.

Two nights later, Ge Xinxin brought a small suitcase from her dormitory.Take out a Technica 3000 and two cassettes.After pulling the curtains tightly, under the light of the red flashlight, she cut the two glass dry plates into 2×4 inches with the glass knife she brought and put them into the film box, and put the rest back into the wooden box and covered it .Then, she put the camera and film box back into the suitcase, put them in the Lingaochan safe in the laboratory and locked them.

The next day happened to be a nice sunny day.In the afternoon, Ge Xinxin took out the body in the suitcase, installed the P65+, set the sensitivity to 50, installed the APO Lanthar 210mm f4.5, set the aperture-shutter to f8, and then gradually increased the shutter speed from 1/25. Step adjustment is as fast as 1/200.Immediately, I replaced the back with a film box, took a picture with shutter speeds of 1/12 and 1/25, and put away the camera, back, and film box.Putting the film box alone in the laboratory locker, Ge Xinxin re-locked the suitcase into the safe.

Back in the laboratory, Ge Xinxin opened the locked drawer at the bottom of the medicine cabinet and took out several bottles of reagents wrapped in black paper.Opening the package, the "National Medicine" label with obvious 21st century characteristics shows their origins - precious medicines from the original time and space.It's not that Lingao's chemical department can't manufacture some of these drugs, but they can't achieve analytical purity.For the sake of caution, Ge Xinxin decided to use the spare parts from the old time and space.She sorted out the sodium thiosulfate, rhodol sulfate, hydroquinone, and sodium sulfite, and put the rest of the reagents back in the drawer.Then, she found borax from the upper shelf of the medicine cabinet and put it on the laboratory bench.

"The only thing that is more comfortable here is that someone helps to clean the beaker." While talking to herself, Ge Xinxin fetched a large 1L beaker.Add 750ml of distilled water to a beaker and heat over a gas burner.Then she entered the balance room, opened the constant electronic balance, and carefully weighed 2.5g of methaminophen sulfate, 6g of hydroquinone, and 2.5g of borax, and then weighed 125g of sodium sulfite with a tray balance, poured it into a beaker, and carefully stirred until The temperature of the liquid in the cup rose to 50°C, and then the heating was stopped.Add 500ml of cold distilled water, stir well and pour into a 1.25L coke bottle, carefully squeeze out the upper layer of air, cover the bottle cap and stick the "developer" label.She then weighed 300g of sodium thiosulfate with a tray balance, dissolved it in 750ml of hot water, added 500ml of cold water, put it into a Coke bottle, squeezed out the air, covered it, and labeled it "fixer".Submerge both bottles of liquid in a cold water bath.

Then Ge Xinxin returned all the reagents and cleaned the electronic balance.Put it into a glass cover with desiccant after power off.Immediately, she called her trainee experimenter, asked her to tidy up all the instruments, and ordered a large basin of warm water to be prepared.

"The flask must be cleaned!" Ge Xinxin said this tirelessly. She didn't have much teacher-student affection for the two girls assigned to her. She never taught them to work except for giving them standards. False words.

After finishing all this, she took off her lab coat, took the commuter car again and headed to Bairen for dinner—this time she planned to go to the farm tea house, which is said to have added several new "Western food": Indian flying pancakes, Spanish seafood fried rice such as.She decided to go for a change.

After dinner, she went back to the old man's residential area in Bairen City, where she also bought an apartment according to the policy - it was the smallest apartment size.Because she mainly sleeps in the dormitory, it is equivalent to using it as a storage room, and it is piled up with personal belongings. In addition to the luggage she brought with her back then, there are also various things purchased in this time and space, mainly bought during the spoils auction. All kinds of objects, including some of her favorite European groceries - the real handmade products of Germany, France, Spain and Italy, if you can take some back to the old time and space, and post them on Weibo It provoked the envious eyes of many girls.

But she came back to the dormitory mainly to take a good bath-there is only a public bathroom in the laboratory dormitory building that can take a shower.After taking a shower in the dormitory, Ge Xinxin dabbed a little of the flower and herbal essential oil she extracted herself—a habit she left behind when she was studying in France—and then boarded the train to the laboratory.The temperature in Hainan in spring was often above 20°C in the original time and space, but it was only about 17°C on clear nights in the 15th century during the Little Ice Age.The evening wind was blowing mixed with moisture, and she suddenly felt a little cold.

"The hair dryer can't be used, it's really troublesome enough." Thinking of the hair dryer that she didn't use a few times after D-Day and has been sleeping for a long time, she couldn't help complaining a little-recently, the industrial port is "saving electricity and running electricity", making a lot of noise. The living electricity consumption of the veterans has been greatly reduced.

Ge Xinxin put her hair back behind her ears with her hands, and looked out of the carriage.Although the factory area, which has an order of magnitude "advantage" compared to other places in the world, has been vigorously polluting, the night sky in the 17th century still has a brilliance that is rarely seen in the 21st century.Sirius in the southern sky declares its status as a bright star of magnitude -1.47 with extremely dazzling brightness.

"Wait, I will re-record your spectra in a year." whispering to herself, Ge Xinxin picked up her handbag and rang the rope leading to the driver's cab to inform the driver to stop at the passenger platform of the chemical plant that was about to arrive .

Back in the laboratory, Ge Xinxin took out a clean rectangular glass tray, poured 1cm deep developer solution into it, put it into the freshly prepared 22°C water bath, and poured a plate of fixer solution into the water bath as well.Separately prepare a plate of 5% acetic acid and a large beaker of distilled water.After taking out the film box from the locker, she arranged the darkroom again and opened the box under the red flashlight.Take out the glass negative plate, gently put it into the shallow dish of developer solution, and look at the watch.Gently shake the shallow plate for 5 minutes, then take out the bottom plate and put it in 5% acetic acid for 10 seconds, quickly take it out, shake it gently in distilled water a few times, and put it into the fixer plate.Also lightly shake the shallow plate for 5 minutes, then take out the bottom plate, wash it with distilled water and insert it on the bottom plate holder.After washing another plate, Ge Xinxin turned on the light, poured the used developer and fixer into a special recycling bottle, and put the fresh ones back into a dark cabinet.Immediately, she called the trainee experimenter on duty to let her pack up the equipment, and she signed the registration book and left the laboratory.

(End of this chapter)