Worcester daily spy. [volume] (Worcester [Mass.]) 1850-1888, 1854-05-15
CEsTER DAILY

small hts ot zinc, until 10 viii dissolve no
more; then add half an ounce of muriate of
ammonia, and boil the whole about three
minutes. Apply little of this solution to
the intended iuncture of cast steel, and soft
solder will flow over the parts as readily as on
tin plate, provided always, that there be no
oxide on the metal.
One of the most beautiful, as well as cheap
and durable materials now in use, is the Pa
pier Muche, manufactured. in immense guam
titles, by the Boston Papier Mache Company,
"a and 20 fremont Street. We have exam
ined this article with great care, and believe
it one Of the most valuable triumphs of me-
chanical genius, especially adapted for picture
frames, black letters for signs, mouldings,
cornices, brackets, busts, chimney ornaments,
ceiling centre pieces, ship caps, and cornices.
1t can be made in lengths OF twenty feet or
more, can be colored throughout, is water
proof, will not crack nor warp, and is in all
respects an Incompatible article, both for
beauty, durability and cheapness, to all sub
stitutes in carved work. Almost all our no.
Bile clipper ships are interiorly ornamented
with this material; also, many public and
private edi6ces, including the Dudley Street
Baptist Church, in Roxbury, the new Unita-
risn Church in Jamaica Plains, and multi
tudes of others. Some interesting facts con-
casion.
Mr.. Dimick, of Ipsilanti, Mich, has dis
covered a new compound for coating sheep,
to be applied Immediately after they are shorn,
so as to make the wool grow, keep the skin
in healthy state, and protect the animal, both
from the scorching rays of the sun, and the
| injurious effects of storms. Mr.. d. has ap-
| piled for patent.
An ingenious improvement has been effect
cd in railroad signals, which consists in a day
and night railroad signal being placed at
crossings, to give warning to travellers of the
| approach of train of cars from either direc-
ton. 1t is so constructed and operated, that
it is made to revolve by the action of the To-
connective itself, some time before it arrives at
the crossing. 1t thereby attracts the attention
of passengers who may be travelling towards
the crossing, and this makes them stop until
the train has passed, after which the signal
adjusts itself, and is ready for the next train.
A diving bell has been sent from New York
city, to be used in examining the bed of the
S'Isquehanna River, for the purpose of select
ing the best site for the railroad bridge, which
is to dispense with the old ferry.
Tin roofs will leak, if not well soldered, Sc
cured, and painted. They should be painted
first with thin coat of red lead, which should
| of red lead mixed with dry clean sand.
Justice, Sprague of Boston, has ruled that the
| patent law goes upon the ground, that when a
man by his knowledge and skill has made and
actually perfected machine, the public are
then put in possession of the invention, and
| have the benefit in some form of that skill,
| the man who comes afterwards cannot deprive
| the public Of that benefit though he may be
| the inventor ofa machine. A machine to an
| ticipate any subsequent discovery, therefore,
| must be perfected THAT is, made SO as to be of
| practical utility, and not be merely expert
mental and end in experiment.
| An Englishman has patented an invention
| having for its object the arrangement jacquard
| apparatus, in a manner suitable iOr opening
| two sheds simultaneously, or separately, for the
| passage of two shuttles, one on each side of a
central warp. For this purpose the usual lift
| ing wires are employed, and those which are
| selected by the cards are moved up by the grip
or frame to make the upper shed in a similar
| manner 10 that ordinarily practised; but the
| perforated board, on which the lower ends Of
| the lifting wires rest, is caused to descend, to-
| gether with the unsolicited wires, by which
means lower shed is opened simultaneously
| with the upper one, thus admitting of two
| shuttles being thrown across, one under and
| the other over middle warp.
| Mr.. Hobbs, the celebrared lock man, denies
| that Day & Newell American lock, under his
care, has been picked He says it has been
operated upon by different parties one hundred
and twenty three days, with the offer of two
hundred guineas as a reward with the strong
national feeling prompting them to pick it,but
| as yet itremains inviolate
Forty-three new steamboats, are now being
constructed at Pittsburg, Pa, and vicinity,
only three of which are wheeled. Ofthe
sternwheel boats. many are of large size, from
| 500 to 1000 tons burthen.
| Experiments have proved that porous sand
and other stones, when stepped for about eight
hours in hot coal-tar, (l69 Reaumur, acq uire
| gree of hardness and become impermeable
to water. Bricks require only four hours. and
the coal-tar at temperature ofninety degrees
Reaumur, to become as hard as rock.
To cleanse metal castings, they are usually
thrown into water calculated by sulphuric or
muriatic acid but as some metal is removed
and the surface left rough, it has been found
that if several organic substances were added
to the acid water, the scale of dirt and oxyd
was removed, the surface of the material be-
ing unattached. Tar added to the acid wster
was found to completely cleanse an iron cast
ing, while another piece of casting, in the
usual acid water, was nearly dissolved.