Point-set type is simply type in which the set width of each type is either an integral or a simple fractional number of points.

At first, unit-set type (q.v.) and point-set type seem nearly the same. One might think that point-set type is just unit-set type using points as the basic unit. But this is wrong, and misunderstands the theory of unit-set type.

In unit-set type, a basic unit is first selected. Typically this unit is related to the body size. This unit is then subdivided into some reasonable number of parts (e.g., 18) and all type is cast to integral unit or simple fractional unit set widths. These units need bear no direct relationship to any point system (indeed, the first unit-set types predated the American point system).

In point-set type, there is no basic unit at all. Point-set type, for all its apparent simplicity, is an ad hoc system where type is simply cast to set widths which are of integral or simple fractional point dimensions. These point-set dimensions have no direct relationship either to each other or to any controlling unit.

It is, for example, possible to design a unit-set type system in which particular sorts are of the same number of units at various body sizes. This is not possible with point-set types.

In his
biographical sketch
of
Julius Herriet, Jr.,
Loy notes that Herriet cut (but did not design)
"several sizes of
Mural and
Façade,
some of them to the
point set
and
uniform-lining
system,
which had been advocated in a series of articles written by N. J. Werner
and published in
*Artistic Printer*."

By at least 1897,
the Inland Type Foundry
was advertising "Unit Set Type"
(with, additionally, their "Standard Line" of uniform vertical alignment).
See
*The Inland Printer*, Vol. 20, No. ? (1897): 358.

For more on this, see the The Inland Type Foundry section of the Unit-Set Type Notebook.

By 1899,
they were advertising "Point-Set" type.
See "Explanation of the Improved Point System" within a type showing
in an advertisement for "Point-Set Old Style Series / Old Style No. 12 - Cast on Standard
Line" in
*The Inland Printer*, Vol. 23, No. ? (1899): 223.

By at least the circa 1939
*Specimen Book of Linotype Faces* (aka "Big Red") - but I suspect
actually much earlier -
the Mergenthaler Linotype Company was offering matrices for composing
"self-spacing" typefaces for tabular work.
See:
"Self-Spacing Faces in
*Specimen Book of Linotype Faces* (ca. 1939)
.

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