Otto Lilienthal : How do people learn to fly

The end of a van with a chubby envelope from a dense paper in hands.

Sea plants, and them some thousand various kinds, are not only a source of food of pets and the person, but also technical raw materials for reception of a good-quality fabric, ioda, alginatov 44, an agar-agar 45, starch, aethers, nitrocellulose, firm spirits, dyes of fabrics, fukoidina 46, acetone, acetic acid and many other things necessary substances.

The general density of gas over a lunar surface cannot exceed Р®-12/sm3 Such density is observed in terrestrial atmosphere at height about 180 km.

Sometimes earthquakes, the truth small, are a consequence of industrial activity of the person. So, filling with water of a bowl of a water basin, zakachka waste waters through absorbing borehole in treshchinnye breeds of the base can cause weak earthquakes (fig. 24).

To gradual destruction of old adjournment on walls of pipes.

However water possesses ability to d and with with about ts i-a days (splitting) on opposite charged ions of hydrogen N + and gidroksila It - i.e. There is an ionisation of the water. In cases of linkage of one of ions with any other substance water from the neutral can become sour (at prevalence of positive free ions of hydrogen) or alkaline (at prevalence negative gidroksilnogo an ion)

liental which allow a bird to gain height on motionless wings. Hence, if to learn secret of the bird's scent also the person here as easily and beautifully can fly..

The skilful watch-maker and the master on all hands, ZHjulen, reading in newspapers and magazines of article about unsuccessful attempts of aeronauts to force the spheres to fly in any direction, has reflected. If aeronauts do not have suitable easy and powerful engine it, watch-maker Zhjulena, has some clockworks with springs. And if such mechanism to force to rotate the small air screw and to adapt the screw for a small sphere in the form of a cigar? Will depart or not?