The sun. [volume] (New York [N.Y.]) 1833-1916, 1893-06-04

ihtoS ~ hUOnIH anu StTAlEnE tnAt n 6tTnlGnt.
point. Slabs Of but one or two inches in thick
ness are said to have such strength that they
sase strip 80 feet long S feet wide. and but )
Inches thick, Is reported as haying been raised
are perfectly di stinct adhe ring to one smother
| stone OF this famous quarry is adapted for
| building ashlar. tagging. curbing. bridge
stone. COPS. stills. steps. &c.
by means OF simple MIXTURE consisting Of
ten parts water. thirty parts LIQUID ammonia.
and sixty parts nitric acid OF about forty de-
grees B.. the rectilcation OF petroleum has
for some time past boen carried on with such
success in Germany as to yield n product pro-
ICES the ordinary OIL The mixture in aues-
ton. after being allowed to cool. is placed in
placed. Into this about one hundred litres
whole agitatod: 1t is then allowed to sottle for
ehisht to ten hours. the slime depending upon
troloam is then syphoned OIL leaving the resi- 81
&C aeld LIQUID at the bottom; Tho pIrihcation IN
the acid mixture and the decomposition OF tho
stone by the same Tho treatment. in ad-
large extent tho odor Of petroleum. while it 10
also claimed to diminish its infiam inability
and increase Its lighting power
Tho impetus given Of late to the American
manufacture OF pearl buttons gives interest to
the statement that what are known to the
trade by that name are made from the shell OF
the mussel and the oyster-the inner lining Of
the shell Of mollusks being an irldescent sub.
AS mother OF pearl. these shells. found in al
most al parts Of the world. VARYING CON
se oand ana ID ths East Ihf n5s.
a a5d the NEXT Is what Is termed the yellow
another kind OF shell in this line comes from
me hns laelhc lsiands and Is Of very beautiful
qualities OF the su bstan co in question are ma.
tive to this country though large number Of
d hs ttEieriSr grade are obtained In the pro-
that 10. the material is cut by lathes into round
them By sharp instrument. or. II holes are
not used. the buttons are made with shanks.
which are attached to them with strong glue.
An improved method OF driving bobbins in
speeder frames Is announced. In the descrip-
ton given 1t isstated that heretofore the bob
bin gear or pinion which engages with the
skew-bevel driving gear IN rowing frames. has
either had Its required elongated hub in one
piece with tho gear. or has been combined with |
ssa tst Tn
n contact with the bolster to have u bearing |
thereon. md. on account Of the rapid wear |
owing to the great speed at which these gears |
are driven-the first desert bed plan entails spe- |
clal expense. since the whole piece OF casting
has to be often renewed. The point or feature
bobbin. gear. which. when applied
to take the place OF WORKOUT gear, wifi fur
nish renewed bearing to ht the bolster.,a and
which may also be provided with means. for
eonbnaton VIII te boobin sS sesr hayus
running bearing. upon the bolster OF a de-
tachable hobbin driving dovice. which serves
TO connect the grnr wi tn tho bobbin: there is |
also provided n chamber for the reception OF
tanning the oil at the Joint between the gear u
and the bobbin-drivlnG arrangement.
1t is found that silver deposited By one OF the Il
various reducing processes on the surface OF a Il
,lsar glass lens has decided advantages over II
metal mirror: the front surface gives the best |
definition. but by silvering the back part of II
,phsrical glass film. or that OF a ground lens. Il
he brillia surfacs will remain untnrnisbsd |
or an indefinite time. and the whitish bioom1
ormed by slow vol1tilization 81 the ipcan-
ldheres with remarkable tenacity and Will
'ear great deal OF beat without bIisterinR or
becoming detached. Much success has attended
ne construction OF such mirrors from tho large
md stlyered within by Liebig's process, VIZ
Nth milk sugar. and ammonia nitrate OF sii.I
pr. glass sphere Of ten or eleven Inches in,I
liSmster may be easily gut into eight or nine'l
istributinR the silverinR, which will re-
uire only gentle friction With = pad OF cotton
nPTTefgnih;sSd With trfie OF rouge to brighten
4 uns dGht-r.d;an. IL So placed that the sec
ave lena OF dense glass; the CON vergent rayg
Vel beam cam; which must bSdsprivsd Ofits heat