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鋸齒式磨豆機的種類及選購注意事項

鋸齒式磨豆機的磨刀有兩種類型：一爲平面式的鋸齒刀；一爲立體的錐形鋸齒刀。（1）平面式鋸齒刀

平面式的机种由两片环状的刀片组成，圆周上布满了锋利的锯齿。启动后，咖啡豆被带进刀片之间，瞬间被切割与碾压成细小的微粒。就家用器具而言，平面式的锯齿磨豆机最接近商用的大型磨豆机，与咖啡店里的磨豆机类似。

（2）立體的錐形鋸齒刀

錐形磨豆刀由兩塊圓錐鐵所組成，錐鐵的表面布滿鋸齒，這兩塊鐵貼合之間的空隙，就是將咖啡豆磨成粉的地方。錐形鋸齒刀所産生的摩擦溫度最低，也最能形成均勻研磨。商用機與手動式磨豆機采用的都是錐形鋸齒刀。

功率較高的磨豆機，研磨速度較快，咖啡粉停留在鋸齒間的時間較短，能磨出低溫咖啡。一般磨豆機功率在70瓦至150瓦之間，功率越高越好。

有些咖啡研磨機研磨的效果很差，研磨出的咖啡粉不夠細。沖煮濃縮咖啡時，萃取不足，使得成品索然無味，所以對于研磨濃縮咖啡而言，特別要注意研磨機的精密度，確定能夠研磨出均勻細致的咖啡粉，從而沖煮出好的咖啡。

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"We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." The boys looked in the direction indicated, but could see nothing. This is not surprising, when we remember that sailors' eyes are accustomed to great distances, and can frequently see objects distinctly long before landsmen can make them out. Mr. Charlton's melancholy eyes seemed to be fixed on space. Just for the moment he had forgotten that he was not alone. Lawrence gave a sympathetic cough. As a matter of fact, he had not yet explained what he was doing there, and the longer the explanation was postponed the better he would be pleased. "You see our patient has gone," Balmayne said smoothly. "As a matter of fact, the whole thing was a ridiculous mistake. But you must not blame us. The blame is due to the charming young lady who sent for you. But that is one of the drawbacks of your noble profession. Goodnight." In one of the inmost circles, a sacred elephant had gone must, breaking his ropes, and confined now by only one leg. The chains fastened round his feet as soon as he showed the first symptoms of madness were lying broken in heaps on the ground. The brute had demolished the walls of his stable and then two sheds that happened to be in his way; now he was stamping a dance, every muscle in incessant motion, half swallowing his trunk, flinging straw in every direction, and finally heaping it on his head. A mob of people stood gazing from a distance, laughing at his heavy, clumsy movements; at the least step forward they[Pg 113] huddled back to fly, extending the circle, but still staring at the patient. In an adjoining stable were two more elephants very well cared for, the V neatly painted in red and white on their trunks, quietly eating and turning round only at the bidding of the driver; but one of them shed tears. The rajah's sleeping-room has at one end a dais ascended by three steps; here the sovereign's bed used to be spread; and here, now, the judges of the Supreme Court have their seats. In the middle of the room was a confused array of benches and tables, and against the walls, also washed with yellow, hung a series of portraits of bewigged worthies. No new clues offered themselves. He detached one of the hard, adhering chunks of gum and dropped it into his pocket, “just in case,” he said, half-grinning, “just in case they transfer themselves somewhere else. I’ll leave twenty-nine of them—and see.” The Lieutenant and Si and Shorty tried to make themselves believe that the noise was receding, showing that the rebels were being driven. At times it certainly was so, and then again it would burst out, Naturally, the boys were big-eyed all the time with the sights that filled the landscape near and far. Wherever they looked they were astonished, and when in a march they came out on a crest that commanded a wide view, they could not help halting, to drink all its wonders in. 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