ed shape, and is then consolidated by heavy pressure. It is
dried by exposure to strong sunlight for several hours.

How to Toughen Paper.--A plan for rendering paper as tough as wood or
leather has been recently introduced; it consists in mixing chloride of
zinc with the pulp in the course of manufacture. It has been found that
the greater the degree of concentration of the zinc solution, the
greater will be the toughness of the paper. It can be used for making
boxes and for roofing.

How to Mend a Broken File.--There is no tool so easily broken as the
file that the machinist has to work with, and is about the first thing
that snaps when a kit of tools gets upset upon the cross-beam of a
machine or a tool board from the bed of an engine lathe. It cannot
even be passed from one workman to another without being broken, if
the file is a new one or still good for anything, if an apprentice has
got anything to do with it, and they are never worth mending, however
great may be their first cost, unless the plaster of Paris and lime
treatment can make a perfect weld without injuring the steel or
disturbing the form of the teeth. Steel that is left as hard as a file
is very brittle, and soft solder can hold as much on a steady pull
if it has a new surface to work from. Take a file, as soon as it is
broken, and wet the break with zinc dissolved in muriatic acid, and
then tin over with the soldering iron. This must be done immediately
as soon as the file is broken, as the break begins to oxydize when
exposed to the air. And in an hour or two will gather sufficient to
make it impossible for the parts to adhere. Heat the file as warm as
it will bear without disturbing its temper as soon as well tinned,
and press the two pieces firmly together, squeezing out nearly all the
solder, and hold in place until the file cools. This can be done
with very little to trim off, and every portion of the break fitting
accurately in place. Bring both pieces in line with each other, and,
for a file, it is as strong in one place as in another, and is all
that could be asked for under the very best of welding treatment.

What will Fasten Pencil Markings, to Prevent Blurring.--Immerse paper
containing the markings to be preserved in a bath of clear water, then
flow or immerse in milk a moment; hang up to dry. Having often had
recourse to this method, in preserving pencil and crayon drawings, I
will warrant it a sure cure.

How to Transfer Newspape