Lectures on Select Subjects in Mechanics, Hydrostatics, Pneumatics, Optics, and Astronomy |
Other editions - View all
Common terms and phrases
altitude angle axis axle ball body bottom brass brazen meridian bucket bulk catgut center of gravity center of motion centrifugal force circle cock cogs cylinder declination degrees dial diameter distance divided draw drawn earth ecliptic edge engine equal equator equinoctial fall feet fixed fluid glass gnomon half heat hole horizon hour-lines inclined plane latitude leather LECT length lever machine mean motion moon move object optic nerve ounces parallel pipe piston plane plate polar circles pole pounds pressure pulley pump quadrant quantity quicksilver raised ratchet-wheel rays receiver refracted right line rise rope scale screw shew side sine specific gravity spring square steam sun's place suppose surface syphon tion troy troy ounces Troy weight trundle tube upper upright valve velocity vessel wedge weight wheel whilst whole winch wire
Popular passages
Page 148 - for 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
Page 147 - account of his invention is as follows.—" 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 Sphteram activitatis, which is but
Page 50 - The second mechanical power is the wheel and axle, in which the power is applied to the circumference of the wheel, and the weight is raised by a rope which coils about the axle as the wheel is turned round. Here it is plain that the velocity of the power must be to the
Page xliii - That very law which moulds a tear, And bids it trickle from its source, That law preserves the earth a sphere, And guides the
Page 148 - that, having a way to make my vessels, so that they are strengthened by the force within them, and the one to fill after the other. I have seen the water
Page xvi - I could never make one that would be of any real use. As soon as I was able to go abroad, I carried my globe, clock, and copies of some other maps besides that of the world, to the late Sir James Dunbar of Durn (about seven miles
Page 283 - to the use of the celestial globe. 1. The latitude of any place is equal to the elevation of the pole above the horizon of that place, and the elevation of the equator is equal to the complement of the latitude, that is, to what the latitude wants of ninety degrees. 2.
Page 225 - object will be formed: which image is viewed by the eye through the eye-glass ef. For the eye-glass being so placed, that the image gh may be in its focus, and the eye much about the same distance on the other side, the rays of each pencil will be parallel, after going out of the
Page 209 - but when they pass obliquely out of one medium into another, which is either more dense or more rare, they are refracted towards the denser medium : and this refraction is more or less, as the rays fall more or less obliquely on the refracting surface which divides the mediums.
Page 271 - hour at any place being given, to find all those places where the sun is then rising, or setting, or on the meridian : consequently, all those places which are enlightened at that time, and those which are in the dark. This problem cannot be solved by any globe fitted up in the common way, with the