ترجمه متن دانش آموزی قیمت 5 تومان یک ساعته میخواستم
پنج سال پیش منتشر شده
تعداد بازدید: 492
کد پروژه: 135703
شرح پروژه
3 A model sextant
A simple sextant can be devised using cork, glue, pins, glass
tube, sealing wax, etc.
The cork is slightly cut away at one end so that the base line of
the protractor is parallel to a diameter when in position. A stout
pin stuck through the centre of the protractor serves as an axis
on which the moving mirror can turn. A piece of glass tubing
drawn out to fit the pin serves as a hinge when stuck to the
mirror slip (7 cm by 1 cm). The silvering is removed from all
except the first centimetre of the mirror slip, and the remaining
clear glass acts as an arm to the instrument and indicates the
angle on the protractor scale.
The fixed mirror is fastened by wax in a slot made in the
protractor with a heated piece of wire or knitting needle. It is
convenient to make this slot 45 degrees to the vertical. Half the
silvering is scraped off this mirror so that the horizon can be
observed through the straw or glass sighting tube which is fixed
with wax parallel to the base line of the protractor.
مهارت ها و تخصص های مورد نیاز
مبلغ پروژه
5,000 تومان
مهلت برای انجام
1روز
وضعیت مناقصه
انجام شده
درباره کارفرما
عضویت شش سال پیش
