The sun. [volume] (New York [N.Y.]) 1833-1916, 1893-12-03

ened surfaces apply to this case. Sonorous
and there is no evidence Of electrical phe.
nomena being concerned. The conclusion ar
rived at Il that the sand. instead Of being.
made ny OF grains wi h fiat and angular sur
faces In the case referred to. a plane surface
Of felspar Is apparent In many OF the grains
the suppostion being that 4 certain proportion
o. quartz and fespar grains Is probably adapt
component would fail Of the result. In one OF
the islands 81 tho liebridesa sani Of this sort
+ SGH4 IS aSssTe 81 srss and
grains, and the larger ones Rre Of rounded
quartz; Many angular fragments OF quarts
OF the whole are dark Granules OF ebert.
The introduction of an artificial humidity
into the English spinning and weaving mills
by the injection OF steam. has not been at
tended by the satisfactory results anticipated.
In addition to the large cost OF such a system.
the failure OF the steam to humidity In proper
tion u the yapor discharged is an important
point noted. and, AS there can be no injection
at a lower temperature than 300. condensa-
ton takes place. causing drip all over the
place But the most serious objection brough hit
against such a use of steam is the Injurious
erfect it has on the health Of the work peopIs.
and. though nearly all humidiilers are SO con-
structed as to blow steam through series Of
large pipes into sheds, the effect is much tho
a Very high pitch As in, ali mills the he
atmosphere Is excessively dry impregnat-
ed with dust and small particles Of cotton.
and consequently injurious to hoalyh. the sys-
TEN most urgently advocated by many 10 the
yeporizinG, OF water. which can be warm In
winter and cold In summer. Dry air causes,
OF course. excessive evaporation from tho
body and affects tho breathing organs, as the
moisture. consequently moisture in the air Is
absolutely necesssry 70 health. Tho pleas
found to be sixty-flvs To ssYenIy-nye per cont
and. therefore. when mills contain only thirty
I'VE to forty-hNe per cent 1t Is unhealthy
simple but effective practice Is in vogue In
Germany for determining. without the aid Of a
chemist whether a fabric OF silk or wool IL
free from Admixture OF cotton fbrss Of FAX.
china grass, or other vegetable constituents.
piece OF the stun TO DO examined. say about
three inches square, Is. after careful cleaning.
plunged into strong sulphurie acid. water be-
ing aiterwaTd added. and the whole boiled. In
about Ave minutes the fluid is poured into a
clean vessel and made strongly alkaline by
saturation with caustic soda. then adding q
few dTops of dissolved orchil aud the mix
ture Il warmed for sGyer9l minutes up 20 a
cent, Of vegetable lhrs eNis's ma the fabric the
reddish violet color OF the oIchi! L. IreclIh-
tated, or. II this takes place only alter heating
for more than I'VE minutes. the quantity
amounts TO less than one It,E cent " Is hbs3;
lut6ly necessary. however thdt siarch shoulu
be removed carefully from Inc stun TO o eN-
nmined. as the presence OF thht sutsthnce
NltlAteE the result, IN iesllus Ehbd~ Ailekei
To be silk he res alt + attained more easily nv
plunRing the sample into hydrOchioTir acid.
the nbTe az TX elnE very soluble IN Surh
acid and II the material contains Wool or cot
ton. II remains behind.
Some ingenious devices IN woodworking
machinery have lately been brought forward.
in sspAeial q boring mechanism to DO used
in making holes for blind mailing IN hard
wood floors. the working being entirely auto
matte; that is the stock is carried forward bY
a futed roll. and is stopped b. a cam at proper /
distances from the boring Of holes By the BIT
which WORKS horizontally. the board bslag |
carried on an angle. Another most useful and ]
novel arrangement In this line Is a hardwood |
flooring marhlne which thEcs the rough i
stock. planes Il on both siies and matches /
IL: there are five cutting cylinders: the |
first having = hsXiile Tar. which allows /
OF the free passage OF irregularities IN stock I
and lnsuTes the presentation q tho cylinders /
Of a uniioTm surface. this being followed by I
top aud side and bottom finishing cylinders:
the side nnishing eylinders are sluipDed with /
Z weighted ehip-bTeaksr bar which prevents i
sPllHteTing the stock there are ak feed rolls /
81 * lnehes diameter. and the back Tolls are /
placed beyond the last cylinder, thus carrying /
AL stock clear through the machine