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Chapter 955 Teaching Blind Date

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    Everyone was gone in a flash, and Elder Niu, who was forced to stay, also said with a moo:

    "When you talk, just pretend that I don't exist."

    When they did this, even Mr. Zhao felt a little embarrassed.

    Not to mention Xiao Zhuzi, who looks like a blushing peach blossom.

    In fact, over the past few months, they have had a lot of contact.  But as the saying goes, the boss competes with the second child, but the third child is defeated.  Because Li Mingyue and Jiang Xueying secretly fought with each other and were wary of each other, Xiao Zhuzi had no chance to take advantage of them.

    As a result, the two of them became more separated than when they were in the capital.

    The longer the silence became, the more awkward it became. Mr. Zhao quickly coughed and said with a smile: "I only know a little bit about it, so I can tell you about it casually. Uncle Niu will correct me if I'm wrong."

    Elder Niu turned a deaf ear and only sailed his boat.  Lao Niu couldn't wait to find a crack in the ground and crawl in.

    "Okay." Zhang Xiaojing nodded, and then listened to Zhao Hao explain to her how the big ship used the rudder to control the steering, the compass to see the direction, the hourglass to time the time, and the star board to position the ship.

    Xiao Zhuzi became distracted while listening, thinking that it had been a long time since Mr. Zhao had been in class.

    She suddenly thought that after returning to Beijing, it would be good to continue to listen to Mr. Zhao's science lectures at home.

    Thinking about it this way, she couldn't help but feel a little happy, and she was no longer so resistant to returning to Beijing.

    ??~~

    "That's it." Mr. Zhao pointed to the needle map on the table with one hand and pointed to the compass pointer with the other: "We will use the Danyin needle after the fifth watch, and then we can enter the Black Water Ocean Uh, Xiao Jing  , didn¡¯t I make it clear somewhere?¡±

    "Ah?" Xiao Zhuzi came back to his senses. He blushed and waved his hands and said, "No, Mr. Zhao said it very well."

    She quickly composed herself and asked, "What does the fifth watch mean?"

    Elder Niu¡¯s hand slipped and he almost pushed out the rudder stock.

    "" Mr. Zhao couldn't help but feel ashamed, thinking that I was wasting my words on my feelings.

    "Does it mean the same thing as our five-night watch?" Zhang Xiaojing asked sheepishly, thinking about it.

    "The duration is the same. The day is divided into ten shifts." Zhao Hao nodded, pointing to the hourglass fixed on the slipway and said: "When this hourglass is drained out, it will be the first watch."

    He paused and then said: "However, 'watch' on the ship is still a unit of speed. One watch is about sixty miles. Slower than this speed is called 'but watch'. Faster than this speed is called 'over watch'  .¡±

    "Then how do we know how fast the boat is and whether it has been updated?" Zhang Xiaojing became completely interested and asked hurriedly.

    "Is this it?" Zhao Hao looked back at Elder Niu and said, "Let me demonstrate it to Miss Zhang."

    "Moo" Elder Niu tried not to speak, and gestured with his eyes to the apprentice who was helping him operate the pole.

    The disciple then picked up a book-sized wooden board and ran to the bow of the boat.

    Through the porthole, Zhang Xiaojing saw him using a little force to throw the board into the sea.

    With a snap, the plank fell flush with the bow of the ship.

    The young apprentice quickly ran towards the stern of the boat. Zhang Xiaojing saw that every step he took was equally close and far, and his pace was very fixed, just like the stringed soldier dolls made by Mr. Zhao, which was quite funny.

    "This is the result of hard work." Zhao Hao explained from the side: "Every time you run from the bow to the stern, the time must be the same, otherwise there will be no food."

    "Can this measure the speed?" Zhang Xiaojing asked in confusion.

    Zhao Hao pointed to the floating wooden board on the sea and smiled without saying a word.

    Zhang Xiaojing only saw the plank, which had almost moved to the stern of the ship without her realizing it.

    She is a good student who can get 100% points in the exam. She immediately started thinking, and in the blink of an eye, she suddenly raised her palms and said:

    "I understand. After the board enters the water, it can be regarded as stationary for a short period of time, but the boat keeps moving forward, so it will soon be thrown to the stern. If people start running at the same time, if they reach the stern of the boat together, then they can be regarded as stationary.  Because the speed of the boat is the same as the speed of people running. So people have to go through training when running from the bow to the stern. This is to improve the accuracy of measurement."

    "Hahaha, not bad." Zhao Hao gave a thumbs up and said to Elder Niu: "How about it, my female disciple Bingxue is smart, right?"

    "Moo" Elder Niu said to himself, it turned out to be a female apprentice.  That old cow shouldn't be here.

    "But sir, what if it's cloudy and rainy and it's difficult to walk on the deck?" Zhang Xiaojing finally got into the mood.  "And what should I do if I can't see the water clearly when I have to take a speed test at night?"

    Elder Niu couldn't help but look stunned. He rarely sailed at night, and he never thought about this problem.  Secretly said: ¡®Unexpected¡¯??Come on.  ¡¯

    "It's actually very simple to be able to work around the clock." Mr. Zhao smiled slightly, as if nothing in this world could trouble him.  "You tie a long rope to a wooden board and throw it from the stern of the ship. Then it only takes a short time to calculate the speed of the ship from the length of the rope."

    "And this method is more convenient and accurate!" Zhang Xiaojing's eyes lit up and she said excitedly: "As long as you make calculations in advance and mark the rope, even illiterate sailors can report the speed at once."

    "Now it's Mr. Zhao's turn to be embarrassed. Girl, why don't you be so smart?"  I just clicked and will answer

    ¡°She is truly the daughter of an idol.  My idol¡¯s genes are just good!

    Elder Niu¡¯s eyes also lit up. Although he didn¡¯t understand that ¡®distance divided by time equals speed¡¯, he intuitively understood that this method was the same as measuring speed on a wooden board.  If, as the two said, it could work around the clock, be more precise, and be operable by illiterate people, it would be a huge improvement.

    "Yes, as long as you tie knots at equal distances on the rope, you can easily measure the speed." Zhao Hao said and smiled at Elder Niu: "I asked someone to get a few ropes like this before I came. Let's try it.  go?"

    "Yeah." Although Elder Niu didn't dare to say anything, he was very moved. However, the caution of the navigator made him dare not believe anything.

    ??~~

    So Elder Niu handed the rudder pole to his apprentice and followed Zhao Hao and the two of them to the stern of the ship.

    Xiwa also brought the things. In addition to the speed measuring rope that Mr. Zhao mentioned, there was also a round timer.

    This device is the "hourglass speed measurement method" improved by European sailors based on the "wooden plank speed measurement method" of the Ming Dynasty.  They measured their distance using ropes knotted at equal intervals and using an hourglass of 14 or 28 seconds.  In this way, the speed of the ship can be expressed by observing the number of knots released every 14 or 28 seconds.

    "To this day, the unit of ship speed is still called "knot" However, the fact that one section is equal to about 1852 meters is only an artificial regulation. Therefore, from the perspective of unifying weights and measures, Mr. Zhao defined one section as one thousand meters.

    In other words, in his territory, there will be no concept of the sea.

    At the same time, in order to round up, he also changed the timing unit to 18 seconds.  In this way, the distance between the two knots changed from the anti-human British system of 23 feet and 7.5 inches to a refreshing 5 meters.

    And Zhao Hao improved the hourglass into a clockwork timer.  As long as the cover of the round timer is screwed all the way, a clockwork sound will be made from the inside and the cover will rotate back.  After 18 seconds, there will be a clang sound, the timer ends, and the rotation stops.

    The structure of this thing is simpler than the mechanical doll he gave to Zhang Xiaojing. For Zhao Shizhen, who has broken several Western clocks, it is a piece of cake.

    Of course, Zhao Shizhen dismantled clocks to make guns, and the clockwork timer was just an insignificant by-product.

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