Evening star. [volume] (Washington, D.C.) 1854-1972, 1909-07-04
SCIENCE NOTES.

In order that its telegraph service shall
not be entirely dependent on the over
land wires. which are subject to con-
STINT interruption by accident, Boston
newspaper has installed a wireless sys-
tenn for general news service on the top
of the building occupied by it. There will
be an aerial Odd feet long, one end Of
which is l43 feet above the ground, and
the other q little less than lou, and in
order that 1t sh.ll be always In readiness
Tor unusual service it is proposed to keep
it constantly operating In the general
newspaper work.
Holes for tree planting have been ex-
cavaled by the Long Island railroad by
blasting with dyn mite. A hole about
two feet deep was first dug with q
postnO.e auger at an angle OF about 30
uegrees with the surface and loaded with
ndIT a SUCK OF ~ per cent dyn mite.
Inns shot q hoie ABOUT two feet deep and
three feet in diameter, leaving the eartn
IN the bottom puiverized suitably for
planting. 1t Is st-ted that two men
can thus excavate 2JU holes per lU-hour
Jay at a cost OF about 77@ cents per hole.
The bureau OF Iapor has recently had
compiled some St~tiStlcS concerning the
rate OF mortality of workmen employed
IN dusty industries. The author took
INTO consideration forty-two occupations
and OF the deaLns from all causes among
males fifteen years of .ge and over l4.o
per cent were from consumption. Accord
ing to Industrial insurance experience the
corresponding portions were ao.3 per cent
Tor occupations exposed to metallic dust,
2s6 per cent for those exposed to mineral
aust, 24.S per cent Tor these exposed TO
vegetable fiber dust, and 81 per cent
Ior those exposed TO animal Ind mixed
iiper aust. lne occupation showing the
highest consumption mortality was grind
ers, among whom 49, per cent OF all
deaths were from that disease. In
eacn occupation group the highest con-
SUMPTION mort~liIy was among persons
IRON 20 to Oh years or age. Inc author
Is of the opinion tnat by proper ventla-
llon that the pei centase or deaths Can De
SO greatly cut down tnat II would re-
suit IN saving or over 22,COO lives an
nLa.ly in this country.
Ine wolk OF deveioping the electric
vehicles seems to have made greater
ST. ides in New York city tnan in any
oIner part of this country very en-
eIseIIc campaign has been conducted by
the leading eiectIlc company, winch set
the example by maning generous use OF
the eiectIlc venicle IN It's own work, with
the result that the storage b-ttery car
is in great favor for many classes OF
service. In order to take proper care
OF the business, this company has two
garages, one of which is very large one.
md twenty charging stations distributed
In different parts of the city SO that
tnefe Is one VI tiltSc ACKNOWLEDGEMENTS di-
ways within reach in case of exhaustion
OF the batteries or other trouble. Be-
sides this the company has thirteen cleo
trio lamp wagons, which take Gre of the
matter Of lamp renewals. Besides this,
the company maintains thirty-slx delivery
wagons and eight heavier trucks. Among
the other large users of electric vehicles
is the New York Transportation Com
p~ny, which has 20 taxicabs In operation,
and also the Adams Express Company
which maintains tifty-dve wagons Of one
and two-ton capacity. There are many
other concerns making use of electric ve-
nic4es, and it Is estimated th~t there are
more of these venic.es In operation in
New York city than in the entire eastern
part of the country elsewhere.