, 1875-03-06
GIANT STlAR-GAZERS.
Two American TolcscDpcs+ the kurg-
ekt lin tho World.

Two American TclcscDpcs+ the kuxg-
ext In tho World.
Noston Letter II The Ntt1 ferk tribune.
When Qallleo'H first Telescope wan mado, which
enlarged IN object less than dlame.ers II
astop!shol tho world. And when Ito finally suc-
ceodcd In making ono that magnl!ied about 80
dismeterB, 1t waB said that tho highest mnHuifJ-
Ing powor had been reachsd, anu plauaibte tca-
eous wero given to snlstantIate the statement.
When, Homewhat later Trauep}lnter tnals tho
celebrated Dorpat telescope OF IiuHsia, with m
object B!ass Of WI inchcs tn aperture, ita snor-
nous power waa the causo OF great Excitement
among astronomers throughout tho world. Tbe
famous Chicago telescope. with its 1875 inch
aparRttro, made by Clark ,& Sous, at a uoss OF
8l801u, Ina till lately boen nt the head OF great
Instruments OF this claHs. At 1ateshoad. near
Newcastle, England, Mr.. Il. s. Nowall's toles-
cope, made by Cooke s. Sons. Of York, with 81
inch hpotaturo has for several years stood as tic
lsrgoRt In tue world, though Of inferior quality
and power. At present tho instrument IN tho
Naval Observatory at Washington, and now In
atutes t1o distinction OF having the largest and
mott effective tofracttng telescope that xas oyor
CONSTRUCTED. This, too, wns mnllo by hcasr1.
Clark, who ha7o nuw nearly completed anothor
OF similar calib1e, ordered by l.. ]. Mccormick,
of Chicago. OF MnOora,ick's reaper famo. THIS,
1t Is Understood, will ba giyon to one OF tho flr-
Rfuta uuiyerhitie8.
These twin "nonsterB of the dcep Sky, not
aoa-"ill, IN every important particular, be the
counterpart of cneh other. Tho only noticeable
differences nro The WashinGton instrument has
M aperture Of 26 ipchoa, willis tho Mccormick
hna one Of a little ovor 49, but only enough to
have It said that 1t ~ the lnrgest In tha world
t1e eonponnd, % objective Or object Esss in tho
1nor weighs 1B0 pounds. In each, tho glass,
Will. tue tube iu which It Is insorted, woighs
about q tou, and tho whole weight NAV bo
roughly estimated At four or tlvo tons. Zach
t,an fnr 1nr1 ~, If HftSf1f fnot
Tho cost Of the Government telescope was elG.-
900 ln currci'cy. That OF tho Mccormick vii. bc
nt the same time, about four ycazs ago, and at
hs same pFlss Eo!a eslnE estimated aa u then
in gold When his instrument should bo complet-
cd. Tie objectiyeB alone, when completed, hro
worth $25, 600 each, and nte capable OF . 1nagui-
fying power Of 900 dlau1etera. though, owing to
tho interference Of the atmosphere, . power of
crease tho surface OF the object Viewed to g. 250,
200 timc4 ita natural slze. ~
The establishment That gives birth to ttoas
uonstor telescopes Ia situated In Cambridge
stAto.Houso: 1t 10 ~ 1,nprstending structure OF
plain brick, two storisa high, about 40 feet lous
by Is feet wdo, With III L Of thu Same width
aud 20 feet long, and small, one.story room,
perhaps PEI 10 10y ~ feess Al tho rover used IL
which more than three-horse power Is Ho!dou,
naodol. Tho firm iH composed OF Mr., Alyau
Clark md bin two sons. They employ about .
ha!f-dozGn haodB, aud nevor haYo, in tue busteal
times, more than ten. Tho sepior NJ. Clark il
now over 10 years Of age, aud did not begin te1o,
scope making till hc waa over 40 yoAts old. Ilc
has acquired Ills knowledge and skill Without
Instruction. lie has never Hcen lena 10 process
of construction in the hauds Of amy QUO out oi
| bis own shop. Yet hero are made Instruments
which no other maker In the world unsurpassed
| or cgualel