加装游标叉丝的光杠杆

An Optical Lever With the Vernier Spider Line

为了提高光杠杆的精度，减小实验误差，对原光杠杆进行了改进，在望远镜的目镜中刻划了游标叉丝。这样使得改进后的光杠杆读数精度达到了０．０５ｍｍ或更高．并用原光杠杆与改进后的光杠杆进行了对比实验．用静态拉伸法测定杨氏模量的实验结果显示，用原光杠杆时，结果的相对误差为５．１％；而用改进后的光杠杆时，对于二十分度的游标叉丝，结果的相对误差仅为２．７％。

classical optical lever was improved with a carved vernier spider line in an eyepiece of the telescope to increase the precision of an optical lever and reduce the error.The precision of the improved optical lever is increased to 0.05mm or higher.A comparative experiment with the original optical lever and the improved one was carried out.In the experiment of determining Young's modulus of elasticity with the static tension,it showed that the relative error with the original optical lever was 5.1%,but by using the improved optical lever which had a verilier spider line with a twenty graduation,the relative error was only 2.7%.