, 1875-05-24

You can atfhlh CLAM, you KNOW, IA y0u chn I
r!ese q wood. Indeed, n'ade otherviaa never st
- eoeins ras Ss.aera%' as' is to to 'tso eee
tho glaha oycnly,-tho cansto ~ fast af
tho otiGc tho :nnttle. as fast Al tho airfaeo. II
ruatsors not whether 1t cool fast or SLOW. bat tu
have good class. tho temperature, II ! may so
nay. rntlht aJnchrou'ze absolutely In nvcry part.
Tint ia impossible in Largo glasses. Wol. then.
suppose Fon woro Aolo n overcome that din.
Guilty. thcrc 10 anosber dlflicnltY formidable II,
tho c1so ; q largo giaases ,'smelI' ;ho c1"re Of
destr',ctlon Of Its power to fcnn an oven image.
Tho - glass fptorrtety euggeats that tho
nsu1e be not Fivcnl Is defective for this rcauon.
mako tho bearings a very important mastar IN
large glasses. with the aim 10 contradict thiH
tendency to fle1uro."
During this conversation, Mr. Clark rol1od ont
THE M'conMlcK GLASS,
which ss finished. 1t is a magnificent affair.
Without meaning irrevoronco. touched It son,o-
the Mau OF Nazareth anointed tho eycH Of him
WHO Waa hor,, blind. Tho crown.glaaa and tho
fint~glasa together arc ~ inchea In lhicknoss !;
tho diameter, clear arorinrs after setstng. 90
strumant, and = Ittilc larger than that in tho
Naval Observatory. This 1clrsctor las bcot
mounted for tlial purpos.s in tho great barrel
sresay spoken Of ana %
space, snd. In regions known, niado vist-
big oblecta nut before recognized. Among
other discoveries, 1t has fountl-Alr. Clark III
formed mo-.tWo companions to G5 Ciy1nf-oro
second, and tho other 10 SECONDS reEnovcdt-
Ia Tho aamo constellation. Mr.. Mccormick
is to 10 congratulated In being nble to mako 80
handsome and 40 uaeful gift to tho scienttdo,
and hone 1t will provo nalso to tho religious
world; The work on tld mounting Of this
splendid, slass ia stayed for tho rrefcnt, the
liberal donor NOT desiring Just now to furnish
the moanH for 4 suitable observatory.
Mr. Clark showed me also
An UNoRoUND D1so ron TUE NEW HAvEx Or
sEhyAroRY,
Il will bo an inch or moro larger than tho Nc
Corin'ck giass. The powor. however, will not
bo Mt,ch Rroater.-tho ratio of real power, M
alr. Clark explained, not bcingt as eomc SIP
roeod, tho ratio Of this squares Of tho diasne-
isso't. Tho two g1asscB arc hid away In tl,o-
proof safe. They arc rot vertically against
propor teatB, aud rolled IN hnd out on cnr,
for which track IL provided to avoid accidents.
The Ciarks aro now making tlltco powerful ~
each }.-onc for tho Austrian Government, onc
for ths patclard 1natltuto In Missouri, anu tho
ether tor
Dn. DRAPER,
Of New York. Tho cusinout Professor IL con-
tomplat!ng notno now methods Il observation,
Which Dir: Clark did not think 1t proper to d.
vnlge. will venture tho surmso, that Dr..
Draper proposes to mount hfs refractor with II
reilector,-thae ia ., plain mirror, tue mirror
movable, and tho telascopc in ixcd position.
likes we'll enough to talk to good 1istonor. So
VIC chats away on tho Bonrccn Of supply for tho
snn'e heat, and othor questions Of interest,
mitch to tho pleasure Of tho visitor.
Before I left, small toleacope mas mounted
and put through Its mosions,--tho ingenuity OF
these now celebrated workman exhibiting itse1f
In Ill the mechanical datah Of telcscopic con.