A TREATISE ON THE PRINCIPLES AND PRACTICE OF LEVELLING |
From inside the book
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Page 3
... TELESCOPE , AND OF THE LINE OF COLLIMATION . 25 ARRANGEMENT OF LEVELLING OPERATIONS . 28 PART II . THE PRACTICE OF LEVELLING . ON RUNNING OR CHECK LEVELS . 33 ADJUSTING THE INSTRUMENT FOR OBSERVATION , ETC .. 35 EXAMPLE OF FIELD - WORK ...
... TELESCOPE , AND OF THE LINE OF COLLIMATION . 25 ARRANGEMENT OF LEVELLING OPERATIONS . 28 PART II . THE PRACTICE OF LEVELLING . ON RUNNING OR CHECK LEVELS . 33 ADJUSTING THE INSTRUMENT FOR OBSERVATION , ETC .. 35 EXAMPLE OF FIELD - WORK ...
Page 10
... telescope when adjusted for observation , and therefore was apparently on the same level ; the distance ( D ) from the instrument to the Castle was four miles and a - half ; consequently , D2 2 D2 20.25 40.50 2 D2 3 13.5 feet , the ...
... telescope when adjusted for observation , and therefore was apparently on the same level ; the distance ( D ) from the instrument to the Castle was four miles and a - half ; consequently , D2 2 D2 20.25 40.50 2 D2 3 13.5 feet , the ...
Page 16
... telescope , and the levelling staves , which is the cause of much annoyance to observers . SPIRIT LEVELS . The Y level , so called from the supports in which the telescope rests , resembling in shape the letter Y , is the * Also a work ...
... telescope , and the levelling staves , which is the cause of much annoyance to observers . SPIRIT LEVELS . The Y level , so called from the supports in which the telescope rests , resembling in shape the letter Y , is the * Also a work ...
Page 17
... telescope , which , in the former instrument , is capable of rever- sion on its supports , for the adjustment of the line of collimation , is , in Troughton's construction , firmly fixed in its place , as is also the glass tube of the ...
... telescope , which , in the former instrument , is capable of rever- sion on its supports , for the adjustment of the line of collimation , is , in Troughton's construction , firmly fixed in its place , as is also the glass tube of the ...
Page 18
... telescope ; consequently more rays of light are admitted to the eye , producing the advantages of greater distinctness . We lately tried a fourteen- inch level , constructed upon Mr. Gravatt's principle , and found that we could ...
... telescope ; consequently more rays of light are admitted to the eye , producing the advantages of greater distinctness . We lately tried a fourteen- inch level , constructed upon Mr. Gravatt's principle , and found that we could ...
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Common terms and phrases
50 base adjustment approximate point b₁ b₂ back sight back staff bench mark calculations centre line centre stake chain clinometer Cloth computed half width construction correct cross wires curvature curve cuttings and embankments datum line depth of cutting determined diagram difference of level direction distance Dover Castle Dumpy Level earth edition engraving equal example field-book Folkstone Foot of bank Fore Sight forward reading forward station give gradient ground Gunter's chain horizontal line hypothenuse Hypsometry Illustrated inches inclined plane instrument J. P. WHITNEY length line A B lines of railway mean height measured Merrimack River method middle area mile object glass observer obtain outer rail parallax perpendicular placed plates point a₁ point H practice radius ratio Reduced Levels refraction represent right angles slope spirit-level stones subtracted superelevation surveyor Tables tangent telescope theodolite tion Top of bank Treatise turnpike road yards
Popular passages
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