Rangefinder. Drawing, description

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Rangefinder. Children's Science Lab

Children's Science Lab

It is difficult to determine the distance by eye. More or less a person copes with this task on level ground. If there is a ravine or a river between the object and the observer, then you can make a mistake two or three times.

A mirror rangefinder will help you accurately estimate the distance to various objects.

(click to enlarge)

Make blanks from 33 mm plywood, thin boards or other rigid sheet material, connect them with wood glue into a longitudinal case, leaving the top cover 4 open. The end walls 5 are made after the gutter has already been glued from parts 1, 2 and 3. Then at the top of the box, fix the 25x50mm mirror strips as shown in the picture. Glue mirror A tightly with BF-2 glue to the bar connecting parts 2 and 5, and mirror B to the flat of the rotating axis.

Insert this axle with its lower end into the hole of part 3, cover the case with lid 4 so that the upper end of the axle falls into the hole of part 4. Put an arrow-pointer (made of tin or aluminum) on the upper end of the axle, lubricating the joint with BF-2 glue, and fasten the protective collar.

The next stage of work is graduation. Measure with a measuring tape or rod 50 m from some vertical object, such as a telegraph pole, and stand at that place. Slowly turning mirror B, align the images of the lower and upper parts of the column. Mark the position of the arrow on the risk scale and write "50 m" against this risk. Then measure 100 m from the post, again combine the images of the "halves" of the post, mark the position of the arrow with a risk, writing against it: "100 m" - etc. After grading the distance between the risks by eye, divide into smaller parts.

The accuracy of the rangefinder also depends on the length of the arrow: the longer it is, the greater the distance its end travels (at the same angle of rotation of mirror B). But it’s not worth making the arrow especially long - the interval of measured distances decreases from this. Insert pieces of glass, thin plexiglass or transparent celluloid into the three holes to prevent dust from entering the instrument.

Paint the finished device with nitro or oil paint in a protective color.

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