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angle appear atmosphere attraction axis become body called cause centre circle colours common conductor contains continue convex Describe the experiment diameter direction distance divided earth eclipse effect electricity equal equator Example experiment Explain fall figure fixed fluid focus force give given glass globe gravity greater half hand heat Hence horizon Illustration inches inclined kind latitude length lens less lever longitude magnet means meant mercury meridian metal miles minutes mirror moon motion move natural object Observation opposite parallel particles pass person piece planets pole position pressure principle produced quantity raised rays of light receiver reflected refraction represents rise round seen side situated sound space stars substance sun's surface tion tube turn vapour vessel vibrations visible weight whole
ii ページ - In conformity to the act of the Congress of the United States, entitled, « An act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies, during the times therein mentioned.
ii ページ - Co. of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit : " Tadeuskund, the Last King of the Lenape. An Historical Tale." In conformity to the Act of the Congress of the United States...
76 ページ - ... and, consequently, the heat at the focus is to the common heat of the sun, as the area of the glass is to the area of the focus. Thus, if a lens, four inches in diameter, collect the sun's rays into a focus, at the distance of twelve inches, the image will not be more than...
21 ページ - If the lines AB and AC be made in proportion to the forces, and the lines CD and DB be drawn parallel to them, so as to complete the parallelogram, then the line which the body A will describe will be the diagonal AD ; and the length of this line will represent the force with which the body will move.
95 ページ - ... and passing through the glass, may be made to converge and unite in as many points between g and h, where the image of the 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...
31 ページ - When the prop is at one end, the weight at the other, and the power applied between them.
60 ページ - That upon very great winds, though they be not accompanied with rain, the mercury sinks lowest of all, with relation to the point of the compass the wind blows upon.
26 ページ - If a line be drawn from the centre of gravity of a body perpendicular to the horizon, it is called the line of direction, because it is the line that the centre of gravity would describe if the body fell freely.
46 ページ - The pressure of a fluid upon any given part of the bottom or sides of a vessel is equal to the weight of a column of that fluid, having a base equal to that part of the bottom or side, and an altitude equal to the perpendicular height of the fluid above it.