New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1878-11-02
SCIENCE FOR THE PEOPLE.

VENTILATION OF BEDRO0Ms.-Im LANCE
has some comments on this topic which may DE read
with as much profit IN NewYOrk a. In London. III says
II man were deliberately to shut himself for some
sI or eight hours daily In stuny roon Win cioseu
doors and windows Uhe doors not being opened even
10 change the air during the period OF ncareerationl
and were then TO complain OF headache anh deohlty'
he would be Justly told that his own want OF ihteii-
gent foresight the cause OF his suffering Ne'erne
less this what the great mass OF people 90 every
night Of their lives with no thought OF their lmpru
dcncc There are few bedrooms In which II Is perfectly
safe TO pass The night without something more than or.
binary precautions to secure an inflow OF fresh air
Every sleeping apartment should OF course have hre
place with open chimney ana III cold weather. ~
we'll n the crate contains a small fire, at least enough
to create an upcast current and carry OH the Vtdleu
mir OF the ROOM In all such cases, however, when
fire is used 1t Is TO see that the AR ura"h
into the room comes from the outside OF The house by
an easy mistake II is possible place the occupant OF
bedroom with fire In a closed house In direct cur
rent OF foul air drawn from all parts OF the estoh
ment. Summer ana Winter, with or without the use
Of fires II is we'll to have free ngress Tor pure ar
THIS should be the venators first concern foui All
will lind an exit il pure air is admitted IN suihcieh'
quantity but II Is not certain pure air VIII be drawn III
II the impure ia drawn away. So far as sleepngr0
are concerned 1t IL to let In air from without le
aim must be to accomplish the object WITHOUT Gndsns
a great fall Of temperature or dfaught Inc WHlno"H
NAV be drawn down an men or Two AT Tue op WIN NJ
and fold or muslin VIII lOIID NCH'i'"'o'
10 take off the feeling of draught Ths with an open
fireplace. will generally suffice ana priduce no nhPIed
ant consequences when the weather IS cnd IL H.
howeyer essential that the outside should nc pure.
Little likely be gained by letting IN ios OF even
town mist.
FABRICs FROM NETTLEs.-The cultivation
in Germany OF the common nette as hbre-prodneihs
plant is encouraging. successful beginning mas bech
made in the district Of Schwalbach in BoVarla-w"l-
known for it's manufacture OF cotton wool and hosiery
NJ "A plarlE worked PLANTATION.
The system used for manipulation the hDres the
same as with hemp The frat gathered harvest proven
good above expectation, the products derived FROM
being of "A remarkably fine condition. The tow looK''
as fine siR the textures themselves ana not ia SHUT
in any way either IN respect to durability excellence
OF those produced from hemp. Extensive tracts oI
woods have in consequence been marked out by the
CHIEF ranger Of the forests and woods and designated
for the cultivation OF the netc. Numerous Inquiries
have been made from all parts Of Germany Hungary
and from switzerland respecting the most prscuchi
methods for its culture The Prnssan Minister OF hsri-
cuure as an Acknowledgement Of the result, mas gwen
instructions samples OF all the nette prodnct from
the materials 10 the finest textures should DE- %'
industrial Museum of CasseL The landowners IN VIC
veteran district. and the members OF the hrltniinlh
Club Of Frankfort, have resolved tnat udeh snod S'
apart acre Of ground for ITS cultivation
Efficient LIGHTNING CONDUCTORs.-At the
recent meeting OF the British Association, DR. Richard
Anderson of the Society of Teegraphc Engineers, read
a paper on lightning conductors, which contained some
advice the prevention OF casualties IN h"n
derstorn- First Of oil" he said, it Is desrabIe That
public recommendation should be made by local ana
authorities, to place lightning conductors on all
EXPOSED or glying buildings. whether public "r PM
,tc az well AS ON those standing near woods and
moist ground. II might be well worth the ulIng OK
pensc to place simple conductors also against trees ~
parks under which there benches, or where persons
are likely 10 gather during Thunderstorm they forming
"A prolific source OF fatal accidents. Above all, no
church. chapel school, prison, other large public Guild
ing ought 10 hc without more lightning con
dnctors. In, II IT Is necessary Ia multiply greatly ligh-
nue conductors IL l. equally 40 that they s"ond b"
tent persons with scientific ms well as practical know"
edge OF the work The testing should take place AZ reg
nr intervals perhaps best IN the Spring before the adj
vent the Summer thundcrsorn,, and II 'hould IKE
wis he mad" whenever building n's been undergoing
gan stem of inspection ~ Lightning conductors
would De most inexpensive The cayahomcirr ns'd Tor
the purpose has been lattcrly much improved In Ger
many. ana small poriaDl" instruments. Of the size OF
dimnutiye are nov hAac; when rave ho,n
durability. Already such system OF inspection aud
French towns"
REPRODUCING DRAwINGs.-Mr. Henry Muir
ply Of the CITY Survey Department, Philadelphia, has
laid before The Franklin Institute simple method Of
reproducing drawings He first covers the paper with
solution Of red pruslae Of potash aud citrate Of iron and
smooth glass surface. Upon this Il laid the prepared
paper and both are backed by a padded frame. The
frame reversed the glass surface coming npuermosj
when the action OF the sun 1--WE minutes rrproduccs
the drawings on the sensitive paper. the tracing Is
then STEPPED IN water for few minutes when isrcady
for use.
A NOVEL CASH DRAwER.-At late exhibit
ton in Falmouth. England, Il Patent Check I'll" was
exhibited, when IL certainly remarkable, # IL does one
half OF what i. claimed for IT, According TO the official
81 If nc ghnuk,eueT vii
check every penny taken and paid better than keeping
cashier and using cheek books. 1t occupies more
time than the ordinary TIL II an assistant should take
money Of customer and fail TO put II the TIL 1t
be detected II only part Of the amount IS put
In Il Will show how much has been Withheld. II any
cash taken out II will show the amount The
till cannot be opened without its being known ana the
number Of times. II will show how much money there
Ought to be in at any time. Any amount OF change
can be left for use and yet none can be taken away
without rs being known. 1t can he left any length OF
time without being cleared, and will show the amount
there ought be without counting the cash. It can
be used as desk or let level with the cOuntrr-top n
required. II shows the number Of customers waited
upon by each assistant and line Is drawn across
the paper close To the glass every hour II tells the
her Of customers al any gwen time" And all these adj
vantages are wound up with the brief statement ill.,
tercst outlay and cost Of working one haifpenny
day"
GOOD Notwithstanding to Professor
j. Lawrence Smith good kerosene should have the fol-
lowing characteristics l. The color should he white or
light yellow, with blue reflection q The OdOr should
be faint and not disagreeabe. 3. The specific gravity
ut 600 Fahr., ought not to 6e below O795 nor above
Os1. 4. when mixed with equal volume OF supluric
acid of the density OF lj3 the color ought not TO be-
come darker, but lighter. petroleum that satisfies
all these conditions, aud possesses the proper flashing
point, may be regarded as pure and safe.
SCENES AT THE CATHEDRAL FAIR
RANDOM NOTES OF PRETTY ARTICLES AND DAINTY
DEVICES FOR ATTRACTING MONEY.
The great far in the new st. Patrick's