Range Bar. -- A bar form of high-low chart in which the range of prices of stocks or commodities may be indicated. See highlow chart.

Rank Chart. -- See rating chart.

Rate-of -Change Chart. -- See ratio chart.

Rating Chart. -- The presentation of the rank of items as determined by the quantitative value of each item.

Ratio Chart. -- A curve chart in which the amount scale rather than an arithmetic scale is so spaced that a straight line diagonally

GLOSSARY ^^^

across the grid represents a unitorni percentage increase or

decrease. Relationship Chart. -- A diagram in which facts, information, etc.,

are arranged to emphasize tlicir relation. Relative Bar Chart. -- See 100% bar chart. Relief Map. -- Map showing elevations and surface undulations of

a geographical unit. Relief maps may also be used to present

statistical data. Route Map. -- A map on which point to point movements of ships,

airplanes, railroads, electricity, etc.. are given. Scatter Chart. -- A chart on which the data has been plotted or

distributed as dots on a grid.

Schedule Chart. -- See progress chart.

Screen. -- A cross-lined screen, usually glass, through which copy is photographed for reproduction as a halftone.

Sector Chart. -- The presentation of data in the form of a circle divided so that each sector is proportional to the corresponding facts.

Semi- Logarithmic Chart. -- See ratio chart.

Shot-Gun Chart. -- See scatter chart.

Signature. -- A folded printed sheet ready to be assembled with other folded sheets to be bound together. A signature usually consists of 16 pages, but it may be 4, 8. 32, or even 64 pages.