Scientific American Supplement, No. 362, December 9, 1882Various
Science
Scientific American Supplement, No. 362, December 9, 1882
Various
Science -- Periodicals
Herr Obernetter relies upon the Star or Stern press--a small
lithographic press--one man sufficing to manage it, who turns a wheel
with large spokes, reminding one of the steering wheel of a ship. The
Lichtdruck plate, gelatine film upward, is laid upon a sheet of plate
glass by way of a bed, the plate having first been treated with a
solution of glycerine and water; it is then inked up as previously
described, except that Herr Obernetter uses two kinds of ink--a thick
one and a thin--applied by two rollers of glue. In the first place, a
moist sponge is rubbed over the surface; then a soft roller covered with
wash-leather, and of the appearance of crêpe, is passed over two or
three times to remove surplus moisture; then a roller charged with thick
ink is put on, and then another with thin is applied. It takes fully
five minutes to sponge and roll up a plate, the rolling being done
gently and firmly. A sheet of paper is now laid upon the plate, the
tympan is lowered, and the scraper adjusted with due pressure; a
revolution of the wheel completes the printing, the well-known scraping
action of the lithographic press being used in the operation.
[Illustration: FIG. 1.--ORDINARY NAPHTHA LIGHTER OF MR. LOISEAU.]
Some Lichtdruck prints are printed upon thick plate-paper, and are ready
for binding without further ado, these being for book illustrations.
Other pictures, that are to pass muster among silver photographs, are,
on the other hand, printed upon fine thin paper, and then sized by
dipping in a thin solution of gelatine; after drying, they are further
dipped in a solution of shellac and spirit.--_Photo. News_.
* * * * *
DOMESTIC ELECTRICITY.
Among the most valuable, and, up to the present time, the least
generally appreciated services that electricity can render for domestic
purposes is that of its application in lighters. At the present epoch
of indifferent matches, to have, instantaneously, a light by pulling
a cord, pressing on a button, or turning a cock, is a thing worthy of
being taken into serious consideration; and our own personal experience
permits us to assert that, regarded from this point of view, electricity
is capable of daily rendering inappreciable services.
According to the nature of the application that is to be made of them,
the places in which they are to be put, and the combustible that they
are to inflame, etc., electric lighters vary greatly in form and
arrangement.
Public-domain text, read in full here on John Shaqi.
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