Daily Richmond Whig. [volume] (Richmond, Va.) 1865-1869, 1865-05-26
- rANrtf.R GRApH.


We have several times had occasion TO men
ton tl,s Abbs Casalis wonderful Invention, by
which he not only transmits from one place 10
another the words Of = despatch, but the very
handwriting Of the person who sends 1t. Asthis
Dov tslegrsphie System is now beginning to re-
csive a practical application on large scale
description ofth apparatus may not be uuinter'
esting to our readers. Imagine a cast-iron frame
shaped like an A, and q pendulum suspended
from its apex. At each foot Of the frame there
is an cleo magnet, through the action OF WiTh
the pendulum, which is Two metres IN lshe'ui
Oscillates between them, aceo' ding - an e'ecuIO
curTent passes from one TO the other. ABOUT Ine
middle Of the shSft OF the pendulum thSie -
sort Of arm or cam, which, At each osTI atiOh'
carsss n lover 6xsd 10 the cross-bar Of the A, TO
describe a circular arc. Al the enu ~ eSOS
o. cillation, this lever twice meets ciieA ana
spring work liked 10 the same eross-bar:
AT the first stroke the metallic vibration IL IN
tsrrupted, and at the second . iorE Is SET IN mo
ton the urongs of which alternately act on the
taetb Of a ratch which is thus forced TO turn, and
in so doing communicates motion TO al endless
scrs,y Ont INTO its own shaft. This endless screw
eanses two small chariOts 70 move simultaneous
": each chariot carries line steel point OF
stylus. Now, as in virtue OF the endless screw
these two uOints move uniformly in the same d.
from at Of the other even b. hairs breadth
il follows that whatever stroke will be described
b. the one, will be initiated with mathematical
exactness by the other. Now, suppose metal
lie plate 70 be placed under each point, these
plates being curved like the circular arcs Ges'
cribed BY the points, then, after certain number
of oscillations Of the pendulum, these points ID
moving along will have described upon 'hs
plates as many parallel lines infinitely close 10
each other as there have been oscillations hehce
the whole surface OF the plate has been gone
over. The plates are in direct communication
vi, h the ground by means Of chains; one OF the
pl4tes we will call the transmitter, the o'her the
recipient. -, -
me sender Of a despatch writes ii with COM
mon ink on a sheet Of timed paper, ana pisces
II on the transmitter. On the recipient we place
a sheet Of chemical paper, impregnated with
solution Of cyanide Of potassium. Let US now
set the pparatus in motion. The current being
est blished, so long as the point Of the transmit,
Ter only touches upon the tin, the electric fluid
will escape into the earth; but no soJntr does II
meet the ink OF the writing, which IS non-con-
ducto-, than the fluid, not finding an escape there
will seek il along the wire which connects the
Two points together. Thus the point which
works on the chemical paper Of the recipient
will prodlce blue stroke on the latter for every
black stroke on the despatch; for steel in contact
with cyanide of potassium, and under tn lnfu-
ence OF a positive current produces blue
Hence, suppOsing the despatch TO have been
w.itten in black II Par.s, and transmitted 10 Ly-
Ons. the correspondent at the latter place Will
receive in blue the exact fac smile OF the
senders handwriting. An order to pay q certain
sum may thus be transmitted with perfect sale
ty.-GAhgnanL