"4900 meters!" The sergeant operating the rangefinder finally reported a number after being busy for a while. Li Di shook his head secretly. The accurate number should be a little more than 5,000 meters. He had just measured it with a laser range finder. However, this number is considered very close. After the artillery is fired, it is not a problem to look at the impact point and make slight corrections. But now we are on a floating dock with very small fluctuations, and the sea is calm. If we are really at sea, the error will probably be several times higher. He watched Lin Hanlong ask someone to set up a small shed and put it on top of the rangefinder.
"What, is this thing afraid of water or the sun?"
"Afraid of everything. Also afraid of tide and salt spray."
"What a delicate thing."
"If you want to use good things, are you afraid of being squeamish?" Lin Hanlong laughed, "I haven't asked for a dust-free vacuum yet..."
"No, no, our navy doesn't need such an awesome thing." Li Di said. For now, the telescopes produced by optical factories are usually stored in moisture-proof boxes for safekeeping. The boxes also contain regularly replaced quicklime to absorb moisture. Even in this way, problems such as mold and salt accumulation are inevitable and need to be used regularly. Use the dedicated lens cloth to wipe gently. Every once in a while, a large number of them need to be returned to the factory for maintenance. This big thing doesn't seem to have any sealing measures. What if it gets moldy and rusty?
"If it weren't for the fact that there were too few one-meter rangefinders, I wouldn't even want these things..."
"How long can we rely on the reserves of the old time and space? Besides, the quantity is not enough for your naval equipment plan." Lin Hanlong said, "This is a test product, and I haven't sealed it - it is easier to disassemble it this way. After all, it needs to be done frequently. Open the adjustment. It will naturally be sealed as a whole when it is actually installed on the ship."
"How's the sealing effect?"
"We have to thank Lao Huang for this. Although there are people in the Senate who scold him as a traitor every day, he has got us a lot of good things, such as suede and fir wood. It is estimated that the trouble-free life of the finished product can last Three to six months.”
The sealing performance of treated high-quality deerskin is acceptable. Although the sap extracted from fir trees is a little yellowish after extraction, it can still be used as optical glue. Lin Hanlong also plans to design several desiccant containers on the rangefinder to ensure dryness inside it. He estimated that after hard work, it would not be a problem for the rangefinder to last three to five months at sea, and then it could be returned to the factory for maintenance. He thought this was fine for an experiment. In the future, the Navy will definitely have dedicated personnel and equipment to be responsible for the maintenance of optical equipment. He just needs to train these people well.
"When do you think the organization will be finalized?" Li Di felt that the performance was barely enough, and a cycle of three to six months was enough. After all, the Navy's warships cannot be continuously deployed at sea for too long.
"You can do it at any time. It's too late to improve the performance." Lin Hanlong spread his hands.
"Okay, then I'll arrange it as soon as possible." Li Di said, "As for the model, I think it's called a trial-type two-meter naval range finder. Just remove the word 'trial' after it's finalized."
It was already evening when Lin Hanlong returned to Bairen from Ma Niao. As soon as he arrived at the optical factory, Cai Junjie reminded him: He has been out for several days and should go home quickly.
"What's the rush?" Lin Hanlong was very careful about the optical factory he built. When he was away from home, he would go to the factory no matter how late he came back. Check whether the production order is normal and whether the workers are producing according to the regulations. "The house is right there. Going back early and going back late is not the same thing."
Cai Junjie had nothing to say. He could only look at his father, Cai Shengjie, who was currently responsible for managing the daily affairs of the factory. He wore a pair of reading glasses with a lanyard on his nose.
He first reported that a veteran of the Nanyang Company came to him and said he had something important to discuss. Lin Hanlong snorted indifferently. There were too many elders who came to see him, and they all had important matters. In the end, they just wanted to "open the back door" to develop some kind of optical instrument.
"Don't worry, he will come back if there is something urgent." Lin Hanlong said, "How is the trial production of the new equipment going?"
The factory has recently received several new grinding equipment - the life of the machinery and equipment produced in Lingao is often very short. First, most of the early parts are of poor quality and assembly accuracy is poor; second, they are upgraded very quickly. Whenever the industrial sector achieves certain After progress, new equipment often improves qualitatively, which causes old equipment to be quickly left out and included in the "elimination" list. Just say that the equipment in his optical factory needs to be replaced with new ones almost every year.
Cai Shengjie took out the craft record book and sent over a wooden box.
"This is the lens produced by the new equipment."
Lin Hanlong picked up the glass lens, turned on the work light, looked at it for a moment, and suddenly frowned.
He was busy at the workbench for a while, then raised his head and said, "Old Cai, give me a call to the Machinery Factory and ask if Yuan Haowen is still in the factory?"
"Chief, it's already dark, and you've just come back. Is there anything you want to discuss tomorrow?" Cai Shengjie advised.
"Hurry up and fight. Yuan Haowen must still be at the Machinery Factory."
"The gap in the equipment you made is a bit too big!" Lin Hanlong took out two freshly ground lenses and placed them on Yuan Haowen's desk. "Look at the lenses ground by your equipment."
As he spoke, Lin Hanlong put his hands on his chest and looked at Yuan Haowen in front of him playfully. Yuan Haowen turned on the work light, took out a piece of white paper and spread it on the workbench. He put on his gloves and slowly placed a lens on the paper, then stacked another lens on top, and then he saw colorful stripes - —Here are the Newton rings produced by the equal-thickness interference effect.
However, the Newton rings at this time really don't look like rings - some are elliptical, some are duck-egg shaped, and in some places many stripes are squeezed together, so they cannot be called rings anyway.
"Old Lin, look at the density and range of the fringes, the radius of the spherical surface should be close to a hundred meters," Yuan Haowen said calmly, "This is already the limit of what the lens grinder can process. How can you grind such a lens?" Where is it going to be used?”
Lin Hanlong was shocked. He originally ground these two lenses to test the accuracy of the newly received lens grinding machine. He did not think of any practical use. Unexpectedly, Yuan Haowen from the machine shop actually saw through it and said, "I It’s just for detection accuracy, I haven’t thought about its practical use yet. However, in history, before achromatic technology matured, lenses with focal lengths of tens of meters appeared..."
"Then there's no need for a ball radius of nearly 100 meters!" Before Lin Hanlong could finish speaking, Yuan Haowen interrupted him, "But our mechanical port really needs such a large-radius arc surface equipment. If it weren't for you to do it every day, The rangefinders, telescopes and artillery units of the navy and army are too busy, so they have already reported to the executive committee."
Yuan Haowen stood up and put his hand on Lin Hanlong's shoulder, "The old time and space fitter's frame level has a graduation value of 0.02mm/1m. At that time, there were no serious fitters in the machine shop, and only a dozen sets of this equipment were carried. Which unit can't use it now? I only have two here. I usually only dare to use one, and I don't dare let naturalized people touch it."
Then he touched the key and opened the cabinet next to the marble slab, and took out a large wooden box with "Frame Level" written on it and a line of small characters "Shanghai Measuring Tools and Cutting Tools Factory".
Yuan Haowen opened the box, took out a 30-centimeter square metal frame, stood it on a marble slab on one side, and said, "This is it."
Lin Hanlong looked at it carefully and saw that the metal frame was about 5 centimeters wide, with straight sides and special patterns. There were V-shaped grooves about three centimeters wide on the bottom and left planes, presumably to facilitate the measurement of the cylinder; There are two levels on the inside of the bottom of the frame, one large and one small, with bubbles inside; the large level is parallel to the frame, and the small level is perpendicular to the frame; there is also the emblem of Shanghai Measuring Tools and Cutting Tools Factory and the words 20um/m on one side. . At this time, the bubble in the large level is steadily stopping in the center.
"The intervals between the scales on the main level are about two millimeters, and the corresponding arc radius is one hundred meters." Yuan Haowen saw Lin Hanlong looking carefully and said slowly behind him.
"No wonder you immediately agreed to set the limit of the lens grinder to 100 meters!" Lin Hanlong suddenly realized: "I didn't expect that we have an optical port and a mechanical port, so why did we think of going together? Even for your mechanical port, You also have to find a way to improve the accuracy of the lens grinder!" He said and laughed.
"What do you mean, this is a big project!" Yuan Haowen took two bottles of kvass from nowhere, handed one to Lin Hanlong, took a sip himself, and said slowly: "I can guess these optical There will be problems with the equipment. Because accuracy is expensive."
Yuan Haowen slowly began to talk: "Everyone knows that the core of standardization is the control and management of accuracy, but how is accuracy achieved?"
"Depend on the test!" Lin Hanlong just took a sip of kvass, and because of the happy conversation before, he decisively interrupted.
"Yes, it depends on testing, or in other words, measurement." Yuan Hao asked for a moment, "What does measurement rely on?"
"Measuring tool!" Lin Hanlong said decisively.
"Yes, the problem lies in the measuring tools!" Yuan Haowen put the kvass on the desk and began to talk at length:
"The accuracy of parts is guaranteed by tool processing and measurement of measuring tools. Who guarantees the accuracy of measuring tools? That is metrology. For example, in factories in the old time and space, each vernier caliper was verified by the Bureau of Metrology once every six months. The accuracy If it is not up to standard, it will be repaired or scrapped, and then it will be bought a new one. Not only the vernier caliper, but also the balance, weights, thermometer, voltmeter, and stopwatch, which one is not a measuring tool? We have not cared about this for so long since D-Day. , coupled with such overload use, it is estimated that half of the measuring tools need to be repaired or even scrapped. Because of this, the design accuracy cannot be guaranteed, which is why your batch of equipment has problems." Yuan Haowen took a sip of kvass and continued said.
(End of chapter)
