The horizontal-out of using the light to look at lowering the first time

摘要

(57) [summary] [purpose]-out conventional horizontal, the time and is time-consuming was inconvenient, by-out the horizontal, so that put out more quickly horizontal. [Configuration] Sucking down and the bulb (4) (3) combined as in figure, and the like by utilizing the light bulb (5) issues a light beam horizontally and square By (6) for the air- It rays out to Happo It is the thing which was to be able to measure the horizontal in the room at a time. When I transferred to a put and a wall or object a thin line in the previous figures (5), it tends to balance the horizontal made a thin line of shadow.