New-York tribune., 1873-06-14
INDUSTRIlL PROGRESS.

| The Prussian Government intend TO bring in gbll
| to make the violation of contracts by workmen will
| their employers a criminal otfense.
| The Russian Ministry of Marine intends to estab
lish in the Baltic and Black Seas training ships fol
sailors on the model Of those existing in England
| This measure is dictated by the urgent necessity
there is to create for the Russian feet nursery OF
| experienced sailors.
The "block system" of working railways by
which trains kept apart upon the same line OF
rails by a certain and inyaTiabe interval of space
instead of by uncertain and variable interval of
time, finds favor In England on lines having heavy
traffic. 1t is used on railways having aggregate
length of 1000 miles and, it is claimed prevents
railroad accidents OF which SO per cent are the result
OF collisions
In the separation Of lead from silver some i'm
proyements have been announced by NM Risuay
and Pauville Of Paris. The argentiferOus lead is
treated with magnesium or aluminium, either alone
or allOyed with zinc, and the rich scum thus OBJ
tanned is amalgamated with mercury. The invent
OTs state that they able TO regeneTate the metals
which have been used in the process or extraction
and thus have greatly reduced the expense OF sepa-
rating the precious metal from the lead.
A simple mode of Photographic printing has been
devised by NJ. Marion of Paris. In consists in
impregnating paper with feIro-prussiate which rem
ders il sensitive TO light. The drawing, which is
made on tracing paper. is laid upon the sensitive
paper as negative and exposed to light after which
the sensitive paper is washed in water. The copy is
then found to be produced on it in white line a
blue ground which may be changed to black the
drawing still remaining white by using tannin
solution.
1t is stated in a French paper that tho important
question Of the reorganization of the French arll-
lery will be shortly settled In consequence of nu-
merous and repeated experiments at TrOuyile, Ca
lais and other places, the Government and the Com
missions have resolved to adopt q model field gun
of callber of eight ceutimeters, presented and IN.
vented by Col. Malard of the Marine Artillery and
at this moment director Of the cannon foundery of
Nevers. A gun carriage of an improved description
will also be adopted.
The advance in the price of coal, and the alleged
efforts Of the coal companies 10 promote strike, are
regarded with concern by The Boston Journal, which
says:
IL becomes a matter Of public interest 20 inquire
whether movement Of the Same description as the
English is not in progress here ami whether 1t may not
rate OF the last few months l s Important we believe,
determine whether there does noVe back Of this
terOus and ineXplcable rise IN coal q combination
which It's selfish ends and regardless equally OF
the rights and OF the people, Is udustrOusly
bullng the market. Present indications point IN TINS
ISOLATION 90 know by whom IL DONE u an exaggerated
and artificial value is 20 he put on one OF the prime
necessities Of life, t Is Wen tnaJ the blame should %
placed where IL belongs
Glvcerine Is recommended as an anti-incrustator
in steam boilers by NJ. Austin, in a communication
addressed 10 the French Society of Civil Engineers.
Being soluble in all proportions, IN water, IL APP
pears according to NJ: Austin To increase very nola,
bly tho sOublity OF lime salts To which the evils OF
incrnstations in boilers are mainly ascribable IN
deed according 10 the author, it really forms with
them soluble compound When the lime salts nc
cumuate 90 such an extent TO be no longer soll-
bic in the glycerne present they are deposited IN
tho form OF "A gelatinOus sediment which does not
adhere % the boiler surface. NJ AUSTIN recon-
mends the employment of one pound Oh glyoerhe t2
every 800 or 100 pounds of coal burnt From actual
trials made with the material 10 Is declared IN the
communication. that tho employment of glycerne
for this purpose aud IN tho manner above DESCRIBED
prcNed successful.