In childhood, many have probably experienced the delight of the books of Jules Verne. The romance of traveling on the Nautilus is impossible to forget even after years. Today the submarine with the same for her periscope is of interest to those who in the future will be the captain. For making a simple periscope need not so much – two vanity mirrors (4) about the size of 50×70 mm and thin-walled durable material (e.g., wood or plastic) from which to make the walls of the optic tube (1), which are adjacent the top (2) and bottom (3) of the knee. Them at a 45° angle set of mirrors. In the process of manufacturing the device can be guided to one of the shows the structural schemes. The length of the spotting scope in the 300 – 400 mm can be considered sufficient. The periscope can be equipped with rotary device and handles that will allow you to feel like a real submariner.
A SIMPLE PERISCOPE
It would seem that there is nothing easier, than to hammer in a nail. This can make any boy, not to mention women. Why is it even the men but this seemingly simple operation sometimes does not go smoothly: the nail is hammered badly and suddenly bent; or the hammer blow falls not on the nail head, and a finger!
The idea to build a small tractor did not come from “itching” technical creativity and the urgent need for mechanization of the farm and the transportation of economic goods. The last appointment of the tractor vehicle, predetermined the necessity of its registration in bodies of Rostekhnadzor. And therefore just note the following. Although most of the units, mechanisms and assemblies used in tractor from written off cars and agricultural machinery, bought them not as necessary, but strictly according to the documents — bills and receipts that subsequently (at the reception) was brought in the office.
Folding bike nowadays. However, its dimensions even when folded great, and to keep it at home and even more to transport on the bus or tram is not always convenient.
The late XIX and early XX centuries – the first self-propelled carriages, steam engines and internal combustion (well, come on) electric! Incidentally, the first threshold speed in a 100km/h overcame it electric. However, then automoile developed rapidly and by the early 30-ies of electric cars were forgotten.
Speed radioact with a sail-wing. Competitions of radio controlled model yachts are one of the most exciting. Silent glide of sailboats on the smooth surface of the pond, clearly they can perform turns and maneuvers gives the audience the illusion of a real sailing regatta. And being a full sailing gear, becoming a member of these competitions, you just — you just take a radio controlled model yacht that is not too difficult, although the work is — for neat and patient.
