Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
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... INSTRUMENTS : THEIR CONSTRUCTION , ADJUSTMENT. JI 30 40 Miles of Long 40 Equal Parts 10 Latiudes umbs Sines 60 V Sines 50 40 40 50 60 70 Chords 1 Sm Tan 10 20 30 10 20 40 50 60 70 20 , 30 40 30 440 50 60 Secants 60 70.
... INSTRUMENTS : THEIR CONSTRUCTION , ADJUSTMENT. JI 30 40 Miles of Long 40 Equal Parts 10 Latiudes umbs Sines 60 V Sines 50 40 40 50 60 70 Chords 1 Sm Tan 10 20 30 10 20 40 50 60 70 20 , 30 40 30 440 50 60 Secants 60 70.
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... Equal Parts Protracting Scales Gunter's Lines The Plain Scale Sector Marquois's Scales Vernier Micrometer Beam Compasses Plotting Scales Pantagraph Coggeshall's Sliding Rule Management of Drawing Paper , & c . General Rules in ...
... Equal Parts Protracting Scales Gunter's Lines The Plain Scale Sector Marquois's Scales Vernier Micrometer Beam Compasses Plotting Scales Pantagraph Coggeshall's Sliding Rule Management of Drawing Paper , & c . General Rules in ...
Page 6
... equal parts ( see page 9 ) , then the points D and E applied to the same scale of equal parts will take the square root of the number . Thus , to take the square root of 3 , set the line across the slider to 3 , open out the compasses ...
... equal parts ( see page 9 ) , then the points D and E applied to the same scale of equal parts will take the square root of the number . Thus , to take the square root of 3 , set the line across the slider to 3 , open out the compasses ...
Page 9
... equal parts are used for measuring straight lines , and laying down distances , each part answering for one foot , one yard , one chain , & c . , as may be convenient , and the plan will be larger or ... EQUAL PARTS . Scales of Equal Parts.
... equal parts are used for measuring straight lines , and laying down distances , each part answering for one foot , one yard , one chain , & c . , as may be convenient , and the plan will be larger or ... EQUAL PARTS . Scales of Equal Parts.
Page 10
... equal parts , and the parts of any distance which are less than tenths of a pri- mary division cannot be accurately taken off from them ; but , by means of a diagonal scale , the parts of any distance which are the hundredths of the ...
... equal parts , and the parts of any distance which are less than tenths of a pri- mary division cannot be accurately taken off from them ; but , by means of a diagonal scale , the parts of any distance which are the hundredths of the ...
Common terms and phrases
accuracy achromatic adjustment altitude axis azimuth beam compasses bisected breadth bubble called chromatic dispersion clamp coincide colatitude compasses construction correct cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure fixed focal length given number goniometer graduated half horizontal inches index glass instru instrument intersection IVY LANE latitude lens lenses limb line of collimation line of numbers line of sines logarithmic means measured ment meridian microscope number of degrees object-glass observed paper parallax perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right angles right ascension round secants sector sextant side Slide Rule sliding speculum spherical aberration spirit level square staff station subdivisions tangents telescope theodolite transit transverse distance triangle tube turning vernier scale vertical circle zero
Popular passages
Page 5 - To which is added, a description of the Principles and Practice of Isometrical Projection. By JF HEATHER, MA -With 14 Plates.
Page 69 - ... that the sine of the angle of refraction bears a constant ratio to the sine of the angle of incidence...
Page 98 - ... of this field of view. We must therefore place some fixed point in the field, of view, and in the focus of the eye-piece, and the point to which the measurement will have reference will be that point of the object viewed, which...
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Page 143 - ... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In taking distances, when the position does not vary from the vertical above thirty or forty degrees, the handles which are attached to the circle are generally most conveniently used ; but in those which incline more to the horizontal, that handle which...
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