The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1871-04-20

Tho Government Operutious-What II BefnR
Done-The Mode Of Working Diamond
Driling-A Hugo Fonrth OF July Fire.
cracker.
During the last four weeks General Newton has shovu
better results at the operations Haess Point
than In nearly double the time before The renewal II
Halets Point reef previously stated In the HERALD
what At occupies the attention Of those In charge a
clearing out He'll Gate Tho shaft in the shape Of rsgu-
lar triangle has reached the extreme depth which q
Intended to sink IT, Tho floor thirytwo feet below lev
water mark thynve feet deep the two sides the
water and about .hrtynine feet the land sde Heading
No. Faragu" has been driven about forty feet and rams
from the south angle parallel with the Shore in order
TO DEEPEN Tun cHANNHL
IN that direction; headings No. aMAdison No. "Hum
phrey" No4, Hoffman" and No. s. sShermann commence
on the west side OF the shaft running directly under reef
mo last four headings average length feet and are
rom 10 to 10 feet wide and from 80 feet high The
height OF course viii be regulated BY the thickness Of thu
rock overhead and win diminish headings approach
the channel No g. "JoRerson." and No. o. "Grant" oom
cnce Ut the angle directly fronting river ano are being
driven under the dangerous part Of the reef Tho lat
terheadng has already reached distance from the SHAFT az
100 feet presents better idea OF what 10 be dane
than other The finished part "a high and ls eet
wide and when completed tho heading win S2S feet LONG,
More than onehrd Of the this heading has been
a' Me- rsgsss vim Ss s ss
Size Of the shaft The work on these headings has necessarily
THE ROCK Is MUCH nARDRR
than found X the other headns A1Ou. my has been
exclusively for work By the diamond drill q which moro
sSa sa1 q
No the south shore The distance At which viii BE-
surveys probably from so to TO Feet 0epeoa upon future
sasss '1 =
i've feet from the shaft ha; been completed between head
fs sam af the
G sss Nj is.a ssi ~
present there employed l experienced miners divided
sssa sss sub
s nh
the meadows Of Mr. :d HaIs M who permits r i
depth % 10 ton: %
fs aDa s:
ra,e the valuation to many hundred dola per acre In
'ns % 4
70 s AND
engineers draughtsmen mako surveys and draw "a
IL
M a.
The amount debris removed from the shaft
Al A. a.. 81 m each
General Newton A. each S:t a. relieved a idnh
hours q labor are exploded leaving clean work th
day relief Heading No !: being entirely wisS -
49, 49, .. :. s., TUE nI4I Hs,1.. DELL ELL
right used extensively in mining work. Is stationed in the
shaft and steam 10 driven through inch rubber pipe to
the machine proper This consists Of simple framewerk
ron about feet high BY three feet square, y
small douse acting oscIAtng engine with cylinder three By
inches, drives the rotary drill, which q hollow
tube, upon the end Of which piece or steel
somewhat les than two inches In n diameter called
-four Of the carbons black diamonds, three
with four in the outer circumference between
each making sixteen diamonds in ALL The setting Of
these stones similar TO the setting Of jewel IN finger
compared with 1.-THE more common ye less useful carbon
bearing that name The market price 10 from three 10 six
dollars EACH small force pump connected with the
chine and worked BY u forces through the tube h
wet This prevents the heating OF the drill same
time softens In measure the surface Of the Tho drill
driven at speed OF about 300 revolutions minute and
capable OF drilling twoinch hole about three feet per
mncrs viii drill hole OF same dimensions six feet in the
time, showing that the machine with It's two attend,
ants and one fireman, will do
THE WORK NINK MEN.
These diamond drills being very extensively IN the
marble and slate quarries OF Vermont and large manu-.
featuring company OF Clarcmont H. extensively
faged In making them f addition e drilling single holes
Der Of drills being used inersectng the oo-
plete cutting 10 made. The engineers calculate that
- THE WORK WILL BE FINISHED
BY the h OF July 1875 but the present progress keps
upon AZ the time when the grand salute viii to the
world the opening Of safe navigation via He'll Gate The
completion OF the excavation will leave the face OF the reef
intact but completely undermined and upheld BY seventy
charged with from three TO ten barrels powder In add
ton there will be powder 10 the galleries headngs all OF
which will be exploded At the same instant After the ex
The channel being relieved Of the dangerous reef viii So
Widoned 40 feet.