Frostburg mining journal. [volume] (Frostburg, Md.) 1871-1913, 1875-08-07
SCIENTIFIC.

CsEruL REcIrEs.-A simple method Of
determining the quantity of cream in any
sample Of milk consists in agitating the
milk in a graduated glass tube with
its bulk of either for four or five min-
utes. Add alcohol in volume equal 70
that Of the milk, and shake for five min,
utcs. Place the tube vertically and allow
it to rest for brief period, when the oily
matter will rise to the surface so that ita
amount may be read off on the scale and
the percentage easily computed.
good transfer paper for copying monu-
mental inscriptions and metallic patterns
may be made by rubbing . mixture Of
black lead and soap over the surface Of
common silver paper.
An OK will consume two per cent of his
weight Of hay per day to maintain his
condition. II put to moderate labor, m
increase Of this quantity to three per cent.
will enable him to perform his work and
still maintain his flesh. If he is to be
fatted, he requires about four and a half
per cent. of his weight daily in nutritious
food.
The strongest side of piece of timber
is that which in its natural position faced
the rorth
A good zinc wash for rooms is made Of
oxide of zinc mixed with common size.
and applied like whitewash. After it IL
dry, put on u wash of chloride of zinc.
which will produce glossy surface.
Too great care Of the health ut this
period of the year cannot be exercised.
Because 4 few days are open. bright. and
warm, all the windows in the house should
not be thrown open. the fires put aNt, pr
fanncls thrown aside. 1t Is better to err
on the safe side, and endure the tritling
discomfort. than. by free exposure, to in
vite pneumonia and other diseases commQH,
during the damp weather OF n late spring.
TO make liquid glue. dissolve 33 parts Of
best glue on the steam bath in u porcelain
vessel, in sc parts of water. Then add
gradually. stirring constantly. parts Of
aqua fortis. or enough to prevent the & lua
hardening when cool.
The alloy popularity known rs oride. from
which large number of watches, chains.
and trinkets are now manufactured, is
made of pure copper 100 parts, tin II parts,
magncsia Is parts, sal nmmoniac ] part.
quickEme. part, tartar of commerce
parts. The copper is first melted,
then the magnesia, sal ammoniac, lime.
and tartar in powder are added little by
little and briskly stirred for half an hour.
The tin is lastly mixed in grains until
oil is fused. The crucible is covered, and
the fusion maintained for 80 minutes,
when the dross is skinned Off and the alloy
is ready for use.
A simple way Of preparing paper for
bank checks bills, etc, 30 that no writing
can be erased without leaving plainly
visible marks, is to pass the sheets through
solution of gallic acid. One milligram
O5l43 Of q grain) is dissolved in N
much pure distilled water, MS will fill an
ordinary soup plate to a moderate depth.
Sandarac ynrnish is the best material
for mcnding plaster models Stturate the
broken surfaces thoroughly, press them
well together, and allow them to dry.
Silvcrware may be kept bright and clean
by coating the articles (warmed) with .
solution Of colloIion diluted with alcohol.
Damrness Will cause honey to become
thin and watcry.