Tags and keywords
NewtonianReflector is characterised by having a
FlatMirror as its
secondary, but there are two types, the
ParabolicNewtonianReflector with a concave
primary and the
SphericalNewtonianReflector with a concave
One snippet refers to a 'telescope tube'. It is assumed here that any
ReflectingTelescope has exactly one part property
tube:Tube, although this name glosses over the details somewhat. In the 17th century there were refractors called aerial telescopes used by the Huygens brothers that had two short tubes and a large air gap to achieve long focal lengths, with the two short tubes connected by taught strings. Some collapsible Dobsonian mount Newtownian reflectors have more of a cage-like truss tube.
Because the part property
tube:Tube has AggregationKind composite it is directly involved in the part/assembly composition hierarchy. We'll see later how it will in turn compose assemblies for the primary mirror, secondary mirror, eyepiece etc.
Light has to get in an out of the
Tube, so it has ports
oLight (this will also serve fine for the hole behind the hole of the primary mirrors of Gregorian and Cassegrain reflectors).
We also have a new ValueType
FocalRatio and a value property
focalLength is "optional" (not necessarily applicable) for every kind of
OpticalElement, the multiplicity of
OpticalElement is [0..1], whereas in
OpticalTelescope it is
fRatio:FocalRatio. Note how
OpticalTelescope has now also been given a
And one snippet refers to 'high visual resolution', which suggests a ValueType
OpticalTelescope now has a value property
resolution:VisualResolution, although it is not specified what resolution counts as "high".