Mätlinjal, avsedd för symmetrimätningar på fordon

摘要

In order to check and measure the skewness of crashed cars before as well as during and after repair it is known to use rulers provided with perpendicularly extending mandrels in both ends, and it is also known to use a ruler that is provided with a magnetic fastening means in one end. These devices are simple and easy to use and provide a surprisingly great precision in work. In reality however one must write down taken measures or remember them between measurements. Furthermore the precision is dependent of the skill or practice of the user of the device since an inclining of the device may change the result, also that the skill at reading a scale and the reading conditions exert a strong influence.