SU18407A1 - Planimeter - Google Patents

Description

By means of the invention, it is intended to obtain a Planett type Planimeter planimeter, enabling it to achieve a more accurate measurement of the area of any value and maintain the vertical position of the device during operation.

In the schematic drawing of FIG. 1 is a side view of the planimeter; FIG. 2- the same during work.

The planimeter consists of a ruler 1 with an eye at the end 2; A bypass spike 5, pointed at the end, is inserted into this eye at a right angle to the ruler, on which the ruler can rotate as if on an axis (or fastened with a pin 4). The ruler is graduated to the entire length (centimeters and inches on both sides), starting from vertical 0 passing through the point of the spiers 5. Along the ruler moves the coupling about with the fork 6, on which a flat wheel 8 with a pointed edge is mounted on the axis 7. The wheel 8 rotates freely, but can be fastened with a screw 9. The coupling is fixed on the ruler by screw 10. The tip of the pin 5 must coincide with the plane of the edge of the wheel 8. The coupling has a hole with a pointer 11 located on the vertical 12 of the wheel 8 for installation the distance between the spire 5 and the lower point 12 of the wheel 8.

So that the wheel 8 does not bend to the sides during the operation of the planimeter and maintain its verticality, the ruler is supported 13, which can be fixed with screws 14 anywhere in the ruler (preferably closer to the end 2). The legs of the support IS 13 terminate in spherical surfaces which serve to hold the device in a normal position with respect to the plane of the drawing. For convenient stowage of the instrument into the case, the support can be rotated 90 ° (to the position shown by dotted line 13). If the edge shiil 5 outlines a figure, then the wheel 8 with its edge will also draw some other figure, the so-called “curve, taught by the teacher. There is a known relationship between these two figures, on the basis of which the calculated area is calculated.

The planter is operated as follows: the sharp end of the capstan 5 (Fig. 2) is first placed in the center of gravity of the figure (approximately by eye). Another handle is pressed onto the coupling 5 so that the wheel 8 with its edge makes on paper the tip of the pin 5 after a short distance to the contour and then pull the measured figure from a point L on it clockwise (or opposite) to as long as

The knock will not come back to the point J., from where they started the bypass. After that, the tip is brought back to the center of the touch, to the point S, and again they press the sleeve 5 so that the wheel S with its edge makes another track 18 ,. During the whole time of the bypass of the figure, the wheel 8 does not tilt to the sides. The distance between the two tracks 12 and 12. is measured, and this distance is multiplied by the length of the lobby (the length of the sensor is visible in the window with the pointer 11, in this case 20 centimeters). If the figure is made on the scale of Ijn, then to get the true value of the area, the result must be multiplied by n. For very large areas or a very tortuous contour, the figure of the figure can be divided into parts, then these parts can be routed separately and the result can be broken.

Subject matter

1. Planner type nlanietra Prita. characterized by the fact that it consists of a ruler 1 with divisions, having 3 nrouses at one end, which includes a bypass angle 3, located at the right angle to the ruler I, and equipped with a movable coupling 5 with a fork 6, carrying wheel 8 at the other end with a sharp edge.

2. When characterized in and. 1 planimeter, the use of support 13, which is movable along a ruler 1, with legs 15 spaced apart and terminating with a ball, serving to keep the driver in a normal position in relation to the width of the drawing.

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