DE36223C - Apparatus for measuring coordinates - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 42: Instruments.

Patented in the German Empire by the io. January 1886.

With the help of this apparatus one can do planimetric work without a compass, ruler, triangle, etc. Measure and calculate figures with ease.

On the accompanying drawing:

Fig. Ι the perspective view of the apparatus,

Fig. 2 the outline,

Fig. 3 shows a cross section from Fig. 2, Fig. 4 shows the side view,

FIG. 5 shows a longitudinal section according to cd in FIG. 2,

6 shows a graphic representation of a parcel to be calculated.

On a rectangular frame A of moderate size, two measuring rods B and C, of which the lower one, JB, lies horizontally, while the upper one, C, is vertical, are connected with a slide D at right angles to one another. The latter is guided in a reinforcement d of the frame A, FIGS. 1 and 2.

The lower rule B rests on a prismatic guide of the frame A approx. 1 mm above the surface of the paper; the same is attached to a reinforcement d ^{1 of} the slide D and the upper scale C on the reinforcement d ^l respectively. let into the same and guided in an incision e of the frame A. In addition, the scale C has a prismatic guide f, FIG. 4, on its rear side, which is screwed onto the frame A directly next to the incision e .

Both rulers are each provided with a vernier b and c , which are guided in the elongated cutouts g and h of the rulers B and C and can be fixed by means of small clamping screws i and k.

The ruler ' B is divided into meters from the middle to both ends; its vernier b can be moved with the beveled and divided edge exactly in front of the division of the scale B and protrudes with the opposite edge about 1 ^x / ₂ mm over the edge of B freely. In this protruding part of the vernier b , exactly in the rear extension of the zero line of the vernier, a small hole 0 is made, in which the needle b ¹ , Fig. 5, is fastened. To carry out the vernier b , the rule C is provided with a cutout / '; exactly vertically above the needle hole 0 of the vernier b is the tip of the needle c ^{l of} the vernier c when the zero line of the same intersects the zero line of the ruler C; the division of the latter is carried out from here in one direction in meters.

To the line resp. Handling of the slide -D, a button m is attached to the back of the rule C above the rule B.

Should z. B. the area of the parcel representing a pentagon, Fig. 6, calculated respectively. are established, one can assume AD as the abscissa line and the projections of points BC and E on AD as ordinates. The apparatus will therefore be placed on the parcel surface in such a way that the front edge of the rule J3 resp. its needle line coincides exactly with the abscissa AD. Then coincide the zero points of the verniers b

and c with the point α of the figure, the abscissa a A can be read from the scale B and the ordinate a B from the scale C , from which the content of the triangle is derived

a A * a B ABa =

yields. In the same way, the lengths a ~ b and bC for calculating the trapezoid a BC b are found and invoiced

aB + bC

= a;

then b D is measured and read to calculate the triangle

cbD = ^bD - ^bC ;

then b E is measured and read off, around triangle

to calculate, etc.

Claims (1)

Patent claim: An apparatus for quickly measuring flat figures and parcels, etc., characterized by a rectangular frame A, on which two rulers B and C crossing at right angles are slidably mounted by means of a slider D attached to them, each of these rulers with a measure division, with a adjustable vernier bc and an attached needle (or a Mefsstift) 6 ¹ C ^{1 is} provided. For this purpose ι sheet of drawings.