The sun. [volume] (New York [N.Y.]) 1833-1916, 1893-06-04
NOTES ON SCIENCE and INDUSTRY

Some scientific pens have been devoted o.
late. in the California papers. to discussing the
feasibility and advantages o!dredging Salmon
River. with q view TO obtaining its concen-
tratcd treasure In the form OF placer. gold-this
to be ACCOMPLISHED by the use Of tho suction
| dred.e recently introduced with 20 much
this .rro.ect that. il once bedrock, can
"a' HG tho H01 s"eo 'aH
Of everything brought within the range
Even rd to pe9bo three n
semicircle taking in. OF course. a fresh swath.
as 1t we're. at each new anchorage. Az the
| movement OF this dredger. tho nozzle being in
the form Of a tlnnEe; convex: with corrugntions
In accordance with the numbor Of revolutions
1t makes PER tho mnnts 9 ,Es sus tIn
dredse. where it is treated according to It's
condition: and It is believed that the Salmon
| River bed contains large amount OF the pre-
cious metal.
In recent statement by Prof. Holden cor
| rection is made of some very prevalent errors
concerning the distances OF stars and planets.
and their size and visibility under the apnlca-
ton of the telescope. Thus. he says. IL the
| brightness OF II star seen with the eye alone is
as bright, with O four: inch telescope it is 400
times as bright. an eiGht-iPch telescope rem,
h nss J45 SOa me5 "G as s5sA y!ssG
Thirty. Rf% si2 inch. sloo tines VIII the
n I@RsS' e eys Thus. While tie mssniiyns
RSe @ I Telescope viii permit mnsniiyine
power not above 400. the TIL rty-siN inch tele-
scope VII permit maGnitying power Of more
stars. for example. But this power cannot be
used on the moon and planets with real ad-
power Of 1000 or 1000 will be the maximum.
Recent investigations. as TO tho action of
tions OF caustic alkalies is much stronger than
water since. except in very dilute solution.
such. or these. caustic soda is found to be
the most active then follows caustic potash.
Of tsmpsrature increases the action of the
alkaes very eonsdsraby and the ss
but aftersard Only Very Slowly, Highly con.
centratod solutions at the ordinary tempera-
and the pure alkaline solutions, not too highly
concentrated. have less action upon glasses
OF sillcic acid: alkaline carbonates. even in
dilute solutions. attack glass much more
than Tt fhe % ot6 S
with that Of the caustic alkalies-
By means of q simple and admirable ar
rangement OF its steam plant the Lake
Roland Railway Company. Baltimore. provides
means for running each cylinder Of a pair Of
tandem compounds separately. II desired,
The engine consists Of two compound tandem
eng Zines. twenty and thirty-six by sixty inches.
boilers at one hundred and sixty pounds'
sSss e Ri e o4 Sen cyaSot that
either engins can be supplied with steam |
Of each other: The exhaust
may 5. taken from pressure eyIIadssr
either into the low pressure lie ons through the
around the condenser Unto the atmosphere,
or directly into the air. In th the eyent
Of &C ,idsnt to the low-pressure cylinder. the
same arrangements can DO made directly from
the high pressure cylinder. Practically. the
syndsr; each Sspss,S Q, SSeiRE
any OF the other cylinders- large heater ia
provided for each engine. which takes the |
overflow from the condenser. and. after rails
steam. forces the feed water through the
composed Of brass tn he's placaS |
n the uptakes from the boilers HEATING the |
esd wator to the point of 200 degrees.
report lately made concerning the geology.
II Ohio gives prominence to the great de-
,osits OF sandstone found In that State. and
4 these yarious and extensive quarry torma-
Ths1 rss fsst BSrss grit s
70 o sandHtone OF remarkable purity and uni
ormity both 10 respect OF chemical compost
ion and physical properties-a fine-gralned
sandstone. Of light nun. gray
srs sSsny hsddsS tSst thu iaam
series OF sheets varying In thickness from Q |
eW inches 70 ten feet or more; In fact. blocks |
en- fYet square Apd onlyiQhS and one -h9lf OF an |
non tnisk nave psen extracted. and With sur.