The Practice of Engineering Field Work, Applied to Land, Hydrographic, and Hyraulic Surveying and Levelling, for Railways, Canals, Harbours, Towns' Water Supply ... Including the Description and Use of Surveying and Levelling Instruments and the Practical Application of Trigonometrical TablesAtchley, 1858 - 324 sider |
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Resultat 1-5 av 61
Side 2
... drawing pen , a T square , and a set square ; if unaccustomed to drawing , the best thing he can do is to apply himself first to tracing , and then to copying some drawings ; dividing a foot square of paper into square inches , and ...
... drawing pen , a T square , and a set square ; if unaccustomed to drawing , the best thing he can do is to apply himself first to tracing , and then to copying some drawings ; dividing a foot square of paper into square inches , and ...
Side 10
... drawing of the chain forward will have to be done going either up or down the side of a hill . This instrument the reader may have very cheaply manufactured , by making a tracing from the plate , pasting it on a bit of drawing - paper ...
... drawing of the chain forward will have to be done going either up or down the side of a hill . This instrument the reader may have very cheaply manufactured , by making a tracing from the plate , pasting it on a bit of drawing - paper ...
Side 13
... drawing rings round it with a red - hot wire ; the centre may be marked with a V , and the other numbers read off by the eye . It is used in the following manner ; having noted the spot to which the offset is to be taken , stand ...
... drawing rings round it with a red - hot wire ; the centre may be marked with a V , and the other numbers read off by the eye . It is used in the following manner ; having noted the spot to which the offset is to be taken , stand ...
Side 15
... drawing a line above and below the figures denoting the chainage at which the station is made . On the ground it is sometimes more troublesome . In grass lands it is easy to cut a triangular mark , or a crow's - foot , just large enough ...
... drawing a line above and below the figures denoting the chainage at which the station is made . On the ground it is sometimes more troublesome . In grass lands it is easy to cut a triangular mark , or a crow's - foot , just large enough ...
Side 20
... draw a perfectly straight line ; for instance , in joining two dis- tant points together by means of a straight line , the edge of the rule has to be placed so as to just pass by the side of the two points ; the pencil or pen must then ...
... draw a perfectly straight line ; for instance , in joining two dis- tant points together by means of a straight line , the edge of the rule has to be placed so as to just pass by the side of the two points ; the pencil or pen must then ...
Vanlige uttrykk og setninger
adjustment ascertain backsight base beam compasses bearing Bristol Channel centre chain line chainage channel chords circle clamp coefficient coincide column compass correct cosecant cosine coversine curve diameter difference of level direction distance ditto ditto divided Dumpy Level English Channel equal exterior angle fall feet fences field-book figures fixed gauge give given ground Gunter's chain half height Holyhead horizontal inches instrument intersection Irish Sea Length of Arc limb manner mark means miles minutes moon multiplied object observations obtain offsets overfall parallax parallel perpendicular plotted portion position practice protractor radius reading regard right angles rise scale secant sextant side sight sine square staff staff-holder station straight line stream subtended subtract surface survey tables taken tangent tangent screw tangential angle telescope theodolite tidal tion traverse triangle velocity vernier plate versine vertical zero دو
Populære avsnitt
Side 43 - IF a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the touching line, the centre of the circle shall be in that line.
Side 50 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Side 50 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
Side 45 - ... subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle ACB, and from the point A let AD be drawn perpendicular to BC produced.
Side 44 - If a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.
Side 44 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Side 62 - But this is no derogation to their truth and certainty, no more than it is to the truth or certainty of the three angles of a triangle being equal to two right ones; because it is not so evident, as "the whole is bigger than a part;" nor so apt to be assented to at first hearing.
Side 169 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Side 50 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles.
Side 45 - Therefore, in obtuse-angled triangles, &c. QED PROP. XIII. THEOREM. In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of...