SU39407A1 - A comparator for determining the ratio of a cropped tape segment corresponding to a registered event to the scale division of the tape. - Google Patents

Description

When using chronographic ribbons, it is very important to determine the ratio of the value of the segment a (Fig. 1) corresponding to the registered event (the line oo corresponds to the moment of the onset of the phenomenon) to the value b of the scale division of the tape, i.e. it is important to determine the ratio a. For this purpose, the Oppolzer comparator is usually used, described in the book L. Yaschöpp. Handbuch der Astronomischen Instrumentenkunde, 2 Band, p. 1062, 1899. The main disadvantage of this comparator is that the proportional division is carried out only for a certain length of the second scale (for example, for 20 mm), and for other lengths other than the main more or less large deviations from proportionality are observed.

The proposed comparator is free from this disadvantage and implements proportional division for any lengths of second divisions. Achieves: this is because a turning guide is applied to the carriage and the comparator.

In the drawing of FIG. 1, the purpose of the comparator is explained; FIG. 2 shows its structure; FIG. 3 explains its theoretical justification.

(533)

The comparator consists of a parallelogram J6, 77 and / 5c with a tensile spring 7 which is used for stretching 7. Side 16 of the parallelogram is provided with a pointer 75 with a thread fastened on it. This thread, along with the pointer 75, changes the position of the parallelogram on a scale between the end threads 6 and 7.

The parallelogram is affected by the roller 5 connected by the rod 27 with the carriage 25 moving along the guide 20. The latter can rotate around the axis 4 with which it is joined by the rod J9. On the carriage 25 there is a bar index 9 for the scale of the guide 20.

The position of the thread 6 can be adjusted depending on the length of the section to be divided by means of a frame 8, which is connected with the guide pin 5 of the driver 20.

The screw 27 and the tension spring 0 serve to move the thread b by turning the guide 20 about the axis 4.

The theoretical foundations of the described device are reduced to a theorem according to which two straight lines intersected by a series of parallel straight lines cut through

them into proportional parts. For the first AB and CD (Fig. 3), intersected by a number of parallel BD, EF, / 1C (Fig. 3), you can write:

DF: DC BE: BA

and in the same way

DF: DC BE: BA HY: HG.

The meaning of these proportions is not violated if we transfer the points O, F n C along the direct OS to the same arbitrary segment or to an arbitrary direct parallel DC; the same is true for the displacements of points B, E and A, as well as //, D and G.

Point C in the device corresponds to a fixed thread 7, a point D is an adjustable thread 6, a point F is a movable direction indicator / 5, a point L is an axis 4 of rotation of a guide 20, a point 5 is an axis of a pin of a bearing 5, a point is an axis of a pushing roller 3, a point / The /-zero division of the scale of the guide 20, the point G-hundredth division of the same scale, the point F is the bar-index 9 of the carriage 25. Parallel BD, EF, etc. are performed using the side of the parallelogram J6, parallel to НВ, YE and etc. - with the help of rod 21. DC line is the area to be measured. Line BA represents the path traversed by the center of roller 3, and the HG scale of guide 20.

At the extreme (lower according to the drawing) position of the roller 3, its axis coincides with the axis of the pin 5 of the driver of the adjustable thread b, and in the other extreme (upper) position of the same roller 3, the axis of the latter falls with the axis of rotation 4 of the guide 20.

At the same time, the index 9 of the carriage 25 stops, respectively, on the divisions O and 100 of the guide rail 20. At the intermediate positions

Moving thread pointer J3, and therefore roller 3, the report on the scale directly gives the desired ratio DF: DC

The screw 14 serves to fix the guide 20 stationary, the handle 15 to move the carriage 25, the pocket mirror 22 to facilitate reading on the scale of the guide 20, the leg 2-day message of the guide 20 of proper stability, and the slide 7 /, 12-for ensuring parallel movement of the adjustable yarn 6.

The measured chronographic tape passes through the bracket 24 into the groove 26 and passes between the rollers 25 and 28. By rotating the handle 29, the belt is moved so that division 16 (applied to the example in Fig. 1) of the second scale is located under thread 7. The rotation of the screw 27 sets the thread 6 above the previous division (in this case / 5) second click. Moving the carriage 25 along the guide 20, set the thread of the pointer 13 on the line OO (Fig. 1) corresponding to the instant of the onset of the phenomenon. A readout on a scale of guide 20 gives fractions of a second in the interval between the division of / 5 and the line oo.

The present invention has been implemented in VIMS (Leningrad).

The subject matter of the invention.

A comparator for determining the ratio of the chronological tape segment corresponding to the registered event to the dividing of the ribbon with the use of a parallelogram moved with a movable carriage, characterized by the use of a rotary guide 20 for the carriage 25, the roller 3 of which is aligned with its axis of rotation extreme position and with the axis of the pin 5 at its other extreme position. to the author's testimony of N. Kh. and F. I. Baranovsky Preynich - Freiberg No. 39407

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