The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1879-12-23

mains to be publicly shown by the test Of time. but
there seems little doubt. however. from what Mr..
Edison predicts that his genius will more be
laureated and mankind again benefited.
In reference TO Mr.. Edisons profound laboratory
secret mentioned in your issue of Sunday would
say that owing to great respect and appreciation
Of his contributions to science trust he will be
ranked with secret process who have extracted
more gold from pockets than from ore.
There tailngs ever heard of that assay
$500 to $500 to the ton as you state. The stamp
mills of Central City. COL. work free milling gold
ores thar assay $40 and under. producing buddled
pyrtous tailings. eagerly sought for fux by the
local smelters. Such tailings. not consumed.
could be either desulphurized by mixing with adobe.
moulding into bricks and burning in kilns. or
cheaply roasted in inclined cylinders with constant
feed and discharge.
To illustrate that low grades are worked by other
methods than wet stamping. will state that OF
1000 tons of that have treated in the last two
years the average value has been under $685. During
last January and February received six hun
dred tons of tailings that assayed on an average
SIG per ton. At the present time Spanish pyrites
are proftably worked. containing two ounces Of sill
yer and few grains of gold to the ton. Any one.
therefore. entering the domain of cheap processes
will find field already pretty well ploughed.
Yours. &C., Z. J. MALLETT, Jr.
PROFESSOR DRAPER RESERVES HIS OPINION ON
MR.. EDIsoNs LATEST DISCOVERY.
The electric light has endeared itself to inventive
minds by tho sheer force OF difficulties ounding
it. and has courted the closest observation every
step mistep in the development. There could be
no doubt of the interest attaching to Mr.. Edson's
latest experiments. the seeming of which
chronicled fully in Sundays HERALD, and his
claims will meet with all the more consideration
because of the discouragements lately thrown
upon his project An attempt yesterday to
sound the opinions of scientific men in
this city upon the last phase OF Mr..
Edison's work revealed disposition to treas- the
whole subject of electric light with great caution.
lesson. and, however confident the Wizard of Menlo
Park may be of his triumph. his fellow scientiste
disposed to demand all the evidence attainable.
reporter found Professor John G. Draper in the
Medical College in Twenty sixth street and asked
his opinion of Mr.. Edison's efforts. go.
to express my convictions until I have seen some
practical test of the invention"
"Did you read its description in the HERALDY
is subject requiring the most exhaustive examine
ton"
.But with that reservation. judging only from the
reports of Mr.. Edson's success. what do you think
of it?''
II don't care to 60 upon record yet" said Pro-
lessor Draper, with o smile I'VE all know that Mr..
improvements before. you know. that did not hold
out. don't mean to say it will be the with
this one. but it will not do to indorse thing too
readily"
"Have you investigated the subject Of carbon
burners in electric lamps?" asked the reporter.
Just as sooD as we get rid of the masons and
some experiments in electric lighting. and after that
/ shall be very happy TO express my opinions.
will say this much. however-4 do not believe that
the invention has reached its completion by CREST
DEAL"