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There are no mechanical modes of propulsion in the streets of the City of Light. The Martians all walk. "I approached the top of the broad hill on which the City is built, and came suddenly out into a square filled again in its park-like center with trees.
The two pieces of work which perhaps will be most permanently linked with the name of Ericsson are the screw-propeller as a means of marine propulsion, and the "Monitor" as a type of warship. In addition to these, however, his life-work was rich in results which bore direct relation to many other improvements in the broad field of marine engineering and naval architecture.
The steam and electric railway, steam propulsion of vessels, and mechanical movement along the highroads had been evolved and advanced to a high standard of perfection, to the untold advantage of the community.
That was withdrawn, and he was forced to climb up one of the pillars; and, as we were charitably inclined, we lent him all the impetus we could by sundry, appliances of switches and rulers, in order to excite a rapid circulation in those parts that would most expedite his up ward propulsion, upon the same principles that cause us to fire one extremity of a gun, in order to propel the ball from the other.
The swinging pendulum, with connected apparatus for compressing air or, perhaps, for generating the electric current, seems to be the most controllable and therefore the safest of the various types of apparatus which are applicable to the utilisation of wave-power for propulsion.
On deck, sailors set the triangular sails on the two masts, to add their propulsion to the momentum of the record-breaker, and the passengers dispersed themselves as suited their several tastes.
There was no means of propulsion, but three heavy guide ropes, trailing on the ground, afforded a feeble and uncertain control. The whole reliance of Andrée was placed, consciously and with full knowledge of the consequences, on the possibility that a strong and favouring wind might carry him across the Pole.
It ground scattered rocks to powder with its crushing wheels, it swayed heavily on ticklish corners, recovering itself with the resistless forward propulsion of the straining teams, until the lights of Three Pine Station began to glitter through the trees. Then a succession of yells broke from the driver, so strong and dominant that they seemed to outstrip even the speed of the unabated cattle.
Any tyro in geography could see by a glance at the map that as navigation was in those days that is, by the propulsion of fickle winds amid the partly known currents of ocean and sea the command of Gibraltar and Malta meant the control of the Levant, and the British held both places. With Spain in French hands, Gibraltar eventually might be taken, but the case of Malta was far different.
THE ORTHOPTER. The term orthopter, or ornithopter, meaning bird wing, is applied to such flying machines as depend on wing motion to support them in the air. Unquestionably, a support can be obtained by beating on the air but to do so it is necessary to adopt the principle employed by nature to secure an upward propulsion.
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