Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
Results 1-5 of 34
Page
... Rule Management of Drawing Paper , & c . General Rules in Geometrical Construction PART II ON OPTICAL INSTRUMENTS . Paga 1 4 14 25 33 33 42 45 47 48 50 50 55 64 · 66 Prism 67 Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 ...
... Rule Management of Drawing Paper , & c . General Rules in Geometrical Construction PART II ON OPTICAL INSTRUMENTS . Paga 1 4 14 25 33 33 42 45 47 48 50 50 55 64 · 66 Prism 67 Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 ...
Page 1
... Rule . ON DRAWING COMPASSES , This instrument consists of two legs moveable about a joint , so that the points at the extremities of the legs may be set at any required distance from one another ; it is used to transfer and measure ...
... Rule . ON DRAWING COMPASSES , This instrument consists of two legs moveable about a joint , so that the points at the extremities of the legs may be set at any required distance from one another ; it is used to transfer and measure ...
Page 8
... rule equally with respect to both the points , so as not to be nearer to one point than the other . It is difficult also so to carry the needle , or pen , that it shall neither incline more to one side than the other of the rule ; and ...
... rule equally with respect to both the points , so as not to be nearer to one point than the other . It is difficult also so to carry the needle , or pen , that it shall neither incline more to one side than the other of the rule ; and ...
Page 11
... Rule . To take off any number to three places of figures upon a diagonal scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first . Vernier ...
... Rule . To take off any number to three places of figures upon a diagonal scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first . Vernier ...
Page 12
... Rule . - To take off any number to three places of figures upon this vernier scale . Increase the first figure by one ; subtract the third figure from the second , borrowing one from the first increased figure , if ne * If the vernier ...
... Rule . - To take off any number to three places of figures upon this vernier scale . Increase the first figure by one ; subtract the third figure from the second , borrowing one from the first increased figure , if ne * If the vernier ...
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
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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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