TSIOLKOVSKY KONSTANTIN: (1857-1935) Russian Scientist.

TSIOLKOVSKY KONSTANTIN: (1857-1935) Russian Scientist. A Pioneer of the astronautic theory, considered one of the founding fathers of rocketry. Rare A.L.S., K. Tsiolkovsky, two pages, n.p., n.d., in Cyrillic. The document being part of a scientific content text related to multistage space rockets, with mathematical formulas and reasoning by Tsiolkovsky, stating in part `...counting the last space rocket train as the first one. Then the ordinal number will be y and we obtain: ? + ? = ?1 + 1.´ further saying `Excluding the x from the equation (25) with the help of this equation, we obtain: (Long formula), With this, we have proved that by counting the trains in reverse, additional speed does not depend on the total number of rockets ?1 train, but only on their reverse order (y).´ Tsiolkovsky concludes this reasoning with a statement `The idea of space rocket trains opens up vast horizons. Its realization makes the conquest of the solar space so real that it takes one's breath away.´ and further again returns to formulas stating `Let's go back to the calculations: We make a table frame by which means it will be easy to calculate the speed of each individual train and the highest full speed...´ A letter of excellent content. Overall age wear and a water stain to the left border, affecting only few words and not the signature, although the whole text remaining perfectly legible. G £1000-1500