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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Page 5
... division upon any one of the scales . Now tighten the screw , and the compasses are set . To reduce or enlarge the Lines of a Drawing.- The line across the slider being set to one of the divisions , 2 , 3 , 4 , & c . , on the scale of ...
... division upon any one of the scales . Now tighten the screw , and the compasses are set . To reduce or enlarge the Lines of a Drawing.- The line across the slider being set to one of the divisions , 2 , 3 , 4 , & c . , on the scale of ...
Page 6
... division marked 4 or 5 on the scale . To take the Square Root of a Number . - The line across the slider being set to the number upon the scale of plans , open the points A and B to take the number from any scale of equal parts ( see ...
... division marked 4 or 5 on the scale . To take the Square Root of a Number . - The line across the slider being set to the number upon the scale of plans , open the points A and B to take the number from any scale of equal parts ( see ...
Page 8
... divisions from the plotting scale and protractor ( p . 33 ) . This point may also be used to prick through a drawing upon an intended copy , or , the needle being reversed , the eye end forms a good tracing point . A STRAIGHT EDGE . As ...
... divisions from the plotting scale and protractor ( p . 33 ) . This point may also be used to prick through a drawing upon an intended copy , or , the needle being reversed , the eye end forms a good tracing point . A STRAIGHT EDGE . As ...
Page 9
... divisions , which are numbered 1 , 2 , 3 , & c . , beginning from the second division on the left hand . The first of these primary divisions is sub- divided into ten equal parts , and from these last divisions the scale is named . Thus ...
... divisions , which are numbered 1 , 2 , 3 , & c . , beginning from the second division on the left hand . The first of these primary divisions is sub- divided into ten equal parts , and from these last divisions the scale is named . Thus ...
Page 10
... 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 primary divisions are correctly in- dicated , as will easily be understood from its ...
... 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 primary divisions are correctly in- dicated , as will easily be understood from its ...
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Treatise on Mathematical Instruments: Their Construction, Adjustment ... John Fry Heather No preview available - 2016 |
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
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