Higher-cost instruments have the graticule marked on the inside face of the CRT, to eliminate parallax errors; better ones also had adjustable edge illumination with diffusing markings . ( Diffusing markings appear bright . ) Digital oscilloscopes, however, generate the graticule markings on the display in the same way as the trace.
42.
On older vectorscopes implemented with cathode ray tubes ( CRTs ), the graticule was often implemented as a silk-screened overlay which was superimposed over the front surface of the CRT . One notable exception was the Tektronix WFM601 series of instruments, which are combined waveform monitors and vectorscopes used to measure CCIR 601 television signals.
43.
In 1921 the Westminster Day Continuation School opened, becoming the School of Retail Distribution 1929 . The class about to graduate in 1939 were called up and sent back to the Stamford Street building where they spent the war years making glass scale graticule to fit into various types of optical gunsights, submarine periscope lenses and the like.
44.
Although the method of construction is not explained by the author, Mercator probably used a graphical method, transferring some rhumb lines previously plotted on a globe to a square graticule ( grid formed by lines of latitude and longitude ), and then adjusting the spacing between parallels so that those lines became straight, making the same angle with the meridians as in the globe.
45.
I had thought the term may be " apex " or " vertex ", but when its on the equator ( or obliquely in between the equator and pole ), those don't seem appropriate the term I am looking for is meant to describe the meridians " sprouting " out of a single point ( i . e ., " radiating " ), such as I tentatively have it now, in discussing the " transverse graticule's radiant ".
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