JB/018/157/002

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a physical one.

Being so exemplified it is
both mathematically and
physically true.

But it may be physically
true without being practically
useful.

A string of propositions in and
by which it is shown what
length of time is occupied by
in the passage of a ray of light
from one of Jupiter's Satellites
to this our globe may be practically
useful: because it may
be subservient to chronological
topography (see Tab. II. p.V)
and thence to navigation capability
to sail
or saving save a ship and its crew
from that destruction which for want
of such information might be
their lot. But a string of propositions
in which it were to
be shewn what length of time
is occupied in the passing of
a ray of light from one of
the stars in the milky way
could not be practically useful:
for in no way could it contribute
to navigation or any
other practical use as above.

Identifier: | JB/018/157/002 "JB/" can not be assigned to a declared number type with value 18.
Date_1		Marginal Summary Numbering
Box	018	Main Headings	chrestomathia
Folio number	157	Info in main headings field
Image	002	Titles
Category	copy/fair copy sheet	Number of Pages	2
Recto/Verso	recto	Page Numbering
Penner		Watermarks	[[watermarks::dewdney & co 1839 [britannia with shield emblem]]]
Marginals		Paper Producer
Corrections		Paper Produced in Year	1839
Notes public		ID Number	6566
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