该方法是以视距尺的定长作基线，利用经纬仪测定基线两端点的竖直角，求出立尺点至测站点间的距离。
This method apply the length of the stadia as base line, survey the vertical angular of the two ends of the base ling by theodolite and get the distance between the station and stadia.
现在注视距面前约10 -20英尺远的其他东西。
Now focus on something else about 10-20 feet in front of you.
可视距离小于2英尺。
无须跑尺自计视距仪是一种新式的测量仪器，经过研究，我们已初步试制成功。
The no staff and self-reducing tacheometer is a new type of surveying instrument designed and constructed by a group of teachers and students of our department.
无须跑尺自计视距仪是一种新式的测量仪器，经过研究，我们已初步试制成功。
The no staff and self-reducing tacheometer is a new type of surveying instrument designed and constructed by a group of teachers and students of our department.
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