Construction
In the following, N is the number of divisions the maker wishes to show at a finer level of measure.
- Direct vernier
- Direct verniers are the most common. The indicating scale is constructed so that when its zero point is coincident with the start of the data scale, its graduations are at a slightly smaller spacing than those on the data scale and so none but the last graduation coincide with any graduations on the data scale. N graduations of the indicating scale would cover N-1 graduations of the data scale.
- Retrograde vernier
- Retrograde verniers are found on some devices, including surveying instruments. A retrograde vernier is similar to the direct vernier except its graduations are at a slightly larger spacing. N graduations of the indicating scale would cover N+1 graduations of the data scale. The retrograde vernier also extends backwards along the data scale.
Direct and retrograde verniers are read in the same manner.
Read more about this topic: Vernier Scale
Famous quotes containing the word construction:
“There’s no art
To find the mind’s construction in the face.”
—William Shakespeare (1564–1616)
“When the leaders choose to make themselves bidders at an auction of popularity, their talents, in the construction of the state, will be of no service. They will become flatterers instead of legislators; the instruments, not the guides, of the people.”
—Edmund Burke (1729–1797)
“The construction of life is at present in the power of facts far more than convictions.”
—Walter Benjamin (1892–1940)