New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1857-06-19
INDUSTRIAL AND SCIENTIFIC INTELLI-
GENCE.

printing eDgravngs mechanically, lately patented BY
NJ G. G1itzner Of Washington, will do for engravers
what the power press has done for printers 1t Is
very simple and compact apparatus, the operation
of which is to ink the plate, wipe it, bring the paper
over it, take impression, and dttach the sheet from
the plate the whole by automatic motions. These
processes have hitherto been performed by hand,
and the wonder is that mechanical method was
not invented forty years ago To understand the great
importance of the subject 1t is necessary to know that
when book to be illustrated by figures OF geometry,
macLDery or the like, there are two principal methods
Of doing the work In the United States and England
tie figures usually cut on wood; the wood cuts are
placed in pages with the types, and the whole printed
by the ordinary printing press In France and Ger
many they generally engrave all the figures on cop
per plate have copies made by the ordinary hand
engravng-press, and place them at the end of the
volume. The cost Of engraving on copper is much
less than that Of making wood cut especially for
simple figures without standings, since in engraving
only the lines have to be cut out about l6l OF an inch
deep while in wood cutting the whole surface of the
block excepting the space occupied by the lines, mast
be dug out lilo of iLch as to leave the figure N
relief The is the with the cost OF press
work, copies from copper plate being much more
expe1 sve than printing from wood cut, but in supe-
rority of finish the engravngs are greatly to be pre-
erred The expense of presswo'k Is ia proportion TO
the number Of copies, the expense OF making the pate
is the same in all cases for these reasons IN France
where the average edition of a scientific work Is SOo
copies publishers copper plates the saving on the
original cost paying for the expense of printing while
they have the advantage of better article. In the
1 nied States where print FOR the million, and
where. besides, skilled hand.labor s very high the
Z. Ina her A bpe
of the question: but We hope that the new press will
work change in this respect.
HEATING AND VENTILATING APPARATus.-MeSsrs
SAWYER Hales invention, intended to be attached to
common stove range, consists OF one or more
pipes contained i'll an envelope, which Is divided
ergthwise into two compartments. The pipes ana Tue
compartments are provided with numerous waves
When the pipes are open and the smoke Is permitted
10 pass through il warns the air contained IN OOth
parts of the envelope, and creates IN each tendency
to draft though 80 long a. they are closed 1t has no
such effect The object Of one compartment Is 10
wam the air OF the ROOM a. soon "a It Is open at top
and bottom the air circuates swiftly through it, and
by reason of this velocity and of the consequent STIR
ring of the atmosphere, the room is warmed much
more rapidly than by n common stove with twice the
amount Of heating surface. The purpose OF the Sec
ond con partmeDt Is ventilation; the top ot opens IN
the chimney. while the bottom, by means OF tin
pipe, opens a remote part of the floor OF the room
Pulling valve puts II in operation, when the cold ar
on the floor the dust, heavy calculations and unpeas-
ant gases are drawn out of the building
LOWERING BoATs AT SEA.-A patent has been
granted to M Clifford for Invention for this pur-
pose. 1t is designed to enable man placed in sus-
pended boat to lower it safely al moments notice,
whether be empty or full OF pas, engeTs aud whether
the sea Is smooth rough whether the snip is at rest
or in motion In the center If the boat across the keel.
| is sua wind!ass az both ends, al ordinary pulley
il fastened to the keel and Immediately over each a
frictioIpulley which viii he described hereat,erl l.
susp ndcd by ropes attached To the side of the boat.
The boat being raised to the proper hight by the usual
means and the ends Of two suspendiug ropes Of
/ acty the same length being firmly occurred to the ex-
/ remtes of the dayits their other ends are passed
/ through the frcion-pueys, through the paleyS on tue
/ keel and are 70 sey inserted in holes bored tJr the
Il purpose through the wiRdass. Preparatory t. TINS.
II long rope fastened 20 the wind ass had been wound
arourd it; and this rope is now pulled upon, and tie
\ susptudug ropes III consequence wound round the
/ wirdass and kept tight by securing the winding rope
The pueys by which the boat has been raised are un
Il hooked ard she is left suspended 10 the daVts POI
/ the purpose OF aslin- the boat to the chip there ar
II on eAch davit iron PronE- one nearly a. hiSh a
II the cuuwae Of the boat ard tie other two feel '"e
II than her keel, These pTouss extend directly down
ward, so that any rirg or ihimble passed up 'Aen
II would fall by it, weight, flea unsuSained. hoPe
II with tbimbes at ther ends next hooked 10 th'
prcpgs those from the upper prongs being passed owe
II the nearest side Of the boat from the lower one
under her and the other side, while all four ar
tightly fastened inside Of her. The boat Il now sa'
pended prevented from rocking an ready for service
The process OF lowering Is Obvious: mAn enters tn
boas unfastens the winding rope, which ne allows Z