伽利略

The Galilean telescope could be used for terrestrial and celestial purposes interchangeably.

伽利略望远镜，可用于地面和天体的目的，可以互换。

If you would like more information on how to build a relatively cheap mounting for your Galilean telescope, just e-mail Tom Williams or Jessica Williams .

如果您想了解更多关于如何建立一个相对便宜的为您的伽利略望远镜的安装，只要用电子邮件汤姆威廉姆斯或杰西卡威廉姆斯的信息。

What is a Galilean telescope?

什么是伽利略望远镜？

From the typical Galilean telescope of 5 or 6 feet in length, astronomical telescopes rose to lengths of 15 or 20 feet by the middle of the century.

从典型的伽利略望远镜的5或6英尺长的，天文望远镜上升至长度达15分或20英尺，由本世纪中叶。

But when he happened to view an object directly through such an instrument, he found that, although the image was inverted, it was much brighter and the field of view much larger than in a Galilean telescope.

但是当他发生的事情，以查看对象直接通过这样一项文书，他发现，虽然图像是倒，这是更加光明和外地的观点要远远大于在一个伽利略望远镜。

The moon has a diameter of about 30 arc minutes, so the Galilean telescope only reveals approximately one-fourth of the moon's surface at one time.

月球有大约直径30弧分，所以伽利略望远镜不仅揭示大约有一次在月球表面的四分之一。

The Galilean telescope was innovative in that he was the first to expand the range of magnification of the new spyglasses beyond 3X, using his particular set of lenses.

在伽利略望远镜是创新的，他是第一次来扩展3倍的放大倍率的新spyglasses范围，用自己一套特殊的镜头。

A Galilean telescope typically has a field of view of about 15-18 arc minutes.

甲伽利略望远镜通常有一个弧约15-18分钟，视场。

From the above picture, you can see that an image, HI, will be viewed upright, making the Galilean telescope useful for terrestrial purposes as well as astronomical.

从上面的图片，你可以看到图像，您好，将被视为正派，使伽利略望远镜地面时有用，以及天文数字。

With the acceptance of the astronomical telescope, the limit on magnification caused by the small field of view of the Galilean telescope was temporarily lifted, and a "telescope race" developed.

与接受该天文望远镜，放大倍率的限制所造成的小视野的伽利略望远镜暂时被取消，和"望远镜种族"的发展。

Compared the voltage negative feedback wire-feeding speed regulation system supported by current positive feedback with the rotational speed negative feedback regulation system, the equivalent condition of the two systems is obtained. Then, a wire-feeding speed regulation circuit for the CO_2 welding machine is designed based on TL494 chip, which has the self-protective function under the condition of current overloading.

通过对电压负反馈配合电流正反馈的送丝调速系统与转速负反馈调速系统的比较，得出了这两种调速系统的等效条件，并采用电压负反馈配合电流正反馈技术，设计了一种以TL494为核心的具有过电流截止保护功能的CO_2焊机送丝调速电路。

Make a model to help you determine the optimal number of tollbooths to deploy in a barrier-toll plaza.

建立一个模型来确定在一个容易造成阻塞的收费区中应该设置的收费亭的最优数量。