In 1892 Ljubomir Klerić patented several appliances in mining (scale, deep well drill, rock breaker ...).
He invented a polar pantograph (1875), a tractograph (1892), a second-line curve drawing device (1899).
With the traction engine, he mechanically conceived irrational, transcendental numbers π and e. He studied "telemetry" and on that occasion he constructed, examined and created a new type of telemetry and set it "to measure the distance in the battlefield".

Klerić studied "telemetry" after which he constructed, tested and developed a new type of telemetry "to measure distances on the battlefield," and decided to give these instruments to the government.
He created the following mathematical tools:
a new typewriter, which he named the polypantograph (1875);
a new compass which he named tractoriograph, or logarithmograph (1892);
a construction of measuring instruments, curvometre and logarithmometre (1899);
a treatise on Kinematic determination of elliptical integrals.
In 1892 Ljubomir Klerić patented several appliances in mining (scale, deep well drill, rock breaker ...). He invented a polar pantograph (1875), a tractograph (1892), a second-line curve drawing device (1899). With the traction engine, he mechanically conceived irrational, transcendental numbers π and e. He studied "telemetry" and on that occasion he constructed, examined and created a new type of telemetry and set it "to measure the distance in the battlefield".
Klerić studied "telemetry" after which he constructed, tested and developed a new type of telemetry "to measure distances on the battlefield," and decided to give these instruments to the government. He created the following mathematical tools:
a new typewriter, which he named the polypantograph (1875);
a new compass which he named tractoriograph, or logarithmograph (1892);
a construction of measuring instruments, curvometre and logarithmometre (1899);
a treatise on Kinematic determination of elliptical integrals.
Ljubomir Klerić