A Treatise on Mathematical Instruments: Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling, in Practical Astronomy, and for Measuring the Angles of Crystals: in which Their Construction, and the Methods of Testing, Adjusting, and Using Them, are Concisley ExplainedJ. Weale, 1856 - 170 pages |
From inside the book
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Page
... Scales of 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 ...
... Scales of 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 9
... vernier scales . Simply - divided Scales . - Simply - divided scales consist ... scale is named . Thus it is called a scale of 30 , when 30 of these small ... SCALES OF EQUAL PARTS . Scales of Equal Parts.
... vernier scales . Simply - divided Scales . - Simply - divided scales consist ... scale is named . Thus it is called a scale of 30 , when 30 of these small ... SCALES OF EQUAL PARTS . Scales of Equal Parts.
Page 11
... scale of six inches in length . In one , the distances between the primary divisions are each half an inch , and in ... Vernier Scales . - The nature of these scales will be under- stood from their construction . To construct a vernier ...
... scale of six inches in length . In one , the distances between the primary divisions are each half an inch , and in ... Vernier Scales . - The nature of these scales will be under- stood from their construction . To construct a vernier ...
Page 12
... vernier scale each one - tenth and one - hundredth of an inch . To take off the number 253 from this scale . In- crease the first figure 2 by 1 , making it 3 ; because the vernier scale commences at the end of the first primary division ...
... vernier scale each one - tenth and one - hundredth of an inch . To take off the number 253 from this scale . In- crease the first figure 2 by 1 , making it 3 ; because the vernier scale commences at the end of the first primary division ...
Page 13
... vernier scale , indicated by the third figure , to the subdivi- sion indicated by the number remaining after performing the above subtraction . Suppose it were required to take off the number 253.5 . By extending the compasses from the ...
... vernier scale , indicated by the third figure , to the subdivi- sion indicated by the number remaining after performing the above subtraction . Suppose it were required to take off the number 253.5 . By extending the compasses from the ...
Other editions - View all
A Treatise On Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2022 |
A Treatise on Mathematical Instruments: Including Most of the Instruments ... John F Heather No preview available - 2016 |
Common terms and phrases
accuracy adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp coincide colatitude compasses construction correction cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure focal length given number goniometer horizontal inches index glass instru instrument intersection latitude lens lenses limb line of chords line of collimation line of numbers line of sines logarithmic marked means measured meridian microscope number of degrees object object-glass observed paper parallax parallel plate pass perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right ascension round secants sector sextant side sixth column slider sliding speculum spherical aberration spirit level square station strument subdivisions tangents telescope theodolite transverse distance triangle tube turning vernier scale vertical circle zero