Lectures on Select Subjects in Mechanics, Hydrostatics, Pneumatics, Optics, and AstronomyT. Tegg, 1839 - Всего страниц: 463 |
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Стр. xxxv
... circle of twelve hours on the dial - plate of a watch , the hour - hand to the sun , and the minutehand to the moon , moving in the ecliptic ; the one always overtaking the other at a place forwarder than it did at their last ...
... circle of twelve hours on the dial - plate of a watch , the hour - hand to the sun , and the minutehand to the moon , moving in the ecliptic ; the one always overtaking the other at a place forwarder than it did at their last ...
Стр. 24
... circle , has a tendency to fly off from its centre , which is called the centrifugal force , and it is opposed to the centripetal or gravitating force , which invariably draws a body towards the nearest or greatest mass that occurs ...
... circle , has a tendency to fly off from its centre , which is called the centrifugal force , and it is opposed to the centripetal or gravitating force , which invariably draws a body towards the nearest or greatest mass that occurs ...
Стр. 25
... circle it described before : which line would actually be a straight one , if the earth's attraction did not affect the pebble , and bring it down to the ground . This shews that the natural tendency of the pebble , when put into motion ...
... circle it described before : which line would actually be a straight one , if the earth's attraction did not affect the pebble , and bring it down to the ground . This shews that the natural tendency of the pebble , when put into motion ...
Стр. 28
... circle A T W ; in the same manner , and by the same law , that a peb- ble is moved round in a sling . And if , when ... circle , it must give such a velocity as the planet would acquire by gravity when it had fallen through half the ...
... circle A T W ; in the same manner , and by the same law , that a peb- ble is moved round in a sling . And if , when ... circle , it must give such a velocity as the planet would acquire by gravity when it had fallen through half the ...
Стр. 29
... circle AT W ; for that circle will now be described by the common center of gravity between K and L. Nay , even the great body S will not keep in the center ; for it will be the common center of gravity between all the three bodies S ...
... circle AT W ; for that circle will now be described by the common center of gravity between K and L. Nay , even the great body S will not keep in the center ; for it will be the common center of gravity between all the three bodies S ...
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Часто встречающиеся слова и выражения
angle ascending node axis axle ball body bottom brass brazen meridian center of gravity centrifugal force circle cock cylinder diameter divided draw drawn earth ecliptic edge engine equal equator equinoctial fall feet fixed fluid force gnomon half hole horizon hour-lines inches inclined plane latitude LECT length lever longest day longitude machine mean motion meridian altitude mirror moon move node noon north pole number of degrees object ounces parallel perpendicular pipe piston plane plate polar circles pole pounds pressure pulley pump quadrant of altitude quantity quicksilver raised ratchet-wheel rays refracted right line rise screw semicircle shadow shew side sine south pole specific gravity sphere steam stile sun's declination sun's place surface Troy weight trundle tube turn the globe valve velocity vessel wedge weight wheel whilst whole winch wire
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Стр. 55 - ... 2. When the prop is at one end of the lever, the power at the other, and the weight between them ; 3.
Стр. 164 - I have taken a piece of a whole cannon, whereof the end was burst, and filled it three quarters full of water, stopping and screwing up the broken end, as also the touch-hole ; and making a constant fire under it, within twenty-four hours it burst and made a great crack...
Стр. 50 - From the principles thus established, it is evident that the earth moves round the sun, and not the sun round the earth...
Стр. xlvii - The Art of Drawing in Perspective made Easy to those who have no previous knowledge of the Mathematics.
Стр. xxxiv - During my two years' stay at Edinburgh, I somehow took a violent inclination to study anatomy, surgery, and physic, all from reading of books, and conversing with gentlemen on these subjects ; which, for that time, put all thoughts of astronomy out of my mind, and I had no inclination to become acquainted with any one there who taught either mathematics or astronomy : for nothing would serve me but to be a doctor. At the end of the second year I left Edinburgh, and went to see my father, thinking...
Стр. 405 - ... 49", which wants 28' 11" of being as nearly in conjunction with the same node at the end of the period as it was at the beginning...
Стр. 4 - ... with odoriferous particle.s, yet these bodies lose but a very small part of their weight in a great length of time. Again, it is said by those who have examined the subject with the best glasses, and whose accuracy may be relied on, that there are more animals in the milt of a single cod-fish, than there are men on the whole earth, and that a single grain of sand is larger than four millions of these animals.
Стр. 345 - If a plate similar to this triangle be made as thick as the distance between the lines ac and bd, and set upright between them, touching at a and b, its hypothenuse ag...
Стр. 163 - An admirable and most forcible way to drive up water by fire, not by drawing or sucking it upwards, for that must be as the philosopher calleth it, infra spheeram activitatis, which is but at such a distance. But this way hath no bounder, if the vessels be strong enough ; for I have taken a piece of a whole cannon, whereof the end was burst, and filled it...
Стр. 164 - One vessel of water rarefied by fire driveth up forty of cold water ; and a man that tends the work is but to turn two cocks, that, one vessel of water being consumed, another begins to force and refill with cold water, and so successively, the fire being tended and kept constant, which the selfsame person may likewise abundantly perform in the interim, between the necessity of turning the said cocks.