Theodolite (nevilir) НВ-1 Rare Russia 1964 in wooden box

Description

Deaf level HB1 (HB-1) with a telescope equipped with a contact cylindrical level and a special device - elevation screw.  Using the elevation screw, the tool is brought into a horizontal position.  Three lifting screws serve for preliminary (inaccurate) installation of the tool on a circular level.  It is used in geometric leveling of the third and fourth accuracy classes.  In HB1 level, the image of the ends of the bubble of the contact cylindrical level together with the prism block transmitting the image of the combined ends of the bubble in the field of view of the pipe and are considered simultaneously with the image of the staff.  The grid of threads is tightly fixed in the frame and does not have fixing screws.  Using the elevation screw, you can tilt the telescope along with the contact cylindrical level in a vertical plane at a small angle.  Therefore, first set the level in the working position according to the verified round level (with a small division price), and before taking the reference on the rail - bringing the cylinder of the cylindrical level to the middle of the ampoule with an elevation screw.
It was produced by the Arsenal factory in a wooden case, from approximately 1949 to 1972.  Produced by the IPZ factory
- standard deviation for determining the excess of 1 km double stroke - 3 mm;
- an increase in the telescope - 31x;
- angle of field of view of the pipe - 1 ° 20 ';
- the diameter of the light hole of the telescope lens is 40 mm;
- the length of the telescope is 175 mm;
- the smallest sighting distance - 3 m;
- the price of dividing the cylindrical level by 2 mm - 20 ";
- the price of dividing the round level by 2 mm - 15 ";
- the mass of the device, kg - 1.8.
COMPLETENESS
MANUFACTURER
Arsenal Plant (Kiev, USSR)