The Princeton union., 1893-04-06
An Electric DetectOr.


An Electric DetectOr.
The electrical apparatus for the de-
lection of flaws or crakss in metal
pieces, which was described some
months ago in the electrical papers,
has been adopted by the French gov.
ernment for the testing Of armor plates
and projectiles The device is so effect
i've that it is said to be practically i'm
possible for any flaw or weakness in
the texture of the metal to escape no.
hce. The operator who desires to test
a given piece of metal stands at the in
strument, while i'll an adjoining room
another operator, who wears head
gear to which two small telephone re-
ceivers are attached, listens to the
nCise produced in the receivers, adjust
ing a movable coil on a graduated scales
until there is silence, or a scarcely per-
ccptihle sound If the object. under
test is perfect the sound remains the
same while the striker of the detector
is moved along it's surface; but, on the
other hand. the slightest flaw OF ine-
quality in the metal is indicated by s;
sudden change in the volume of the
received sound. -ms. u.s.. ).
High Speed Railroad Records
While electrical traction is promising
to encroach on the large territory here
tofore enjoyed exclusively by the steam
railroad engineer, the latter has not
been idle. One of the new Vauclain
compound locomotives which were in
troduced lately on the Philadelphia 4
Reading railroad, it is claimed, broke
the record the other day for one, two
and five miles on the line between Phil
adelphia and New York One mile was
made in 81 seconds, which was equal
to a rate Of 97.3 miles per hour; two
miles We're made in Is seconds, and five
miles in 2O5 seconds, which correspond
respectively to a rate of 96 and 81 s
miles per hour. The locomotive was
drawing the usual train, and the time
was taken with a stop watch. While
this was an exceptionally fast run, il
nevertheless was not much above the
normal schedule OF speed. From al
reports the engine ran4well. but the
question still remains whether it il
practicable to run such heavy machine:
with rapid reciprocating parts and re
main within reasonable limits of safe
ty.-The Electrical World. -
/ Chalk and Greasy Belt.
There are many places where leather
\ belts are used so greasy from drip
pings that cannot be we'll prevented
from flying oil and spray, or from othe
unavoidable causes, that they becom,
thoroughly saturated with grease, s.
much so that they become very inefi
cient and practically useless until tn
grease is washed off or otherwise re
moved. It is said that q belt SO dis
abled can be best renovated by the us
of common chalk. Take large piec
of chalk that will cover the width Q
the belt, and hold it hard against
: while running. The chalk takes up tn
grease as it is worn off by the frictiol
Of the belt After chalking awhile
take scraper and hold it against th
Z belt in such a. manner as will scrap
/. the accumulated mixture of chalk an
grease all off. and then renew tn
chalking operation, and keep repeatin
! until the belt is in good working col
! dition, when the cleaning process ca
= be discontinued until it becomes dirt
again. This is simple remedy, an
: is by some considered the best wa
for keeping greasy belts clean and j
good working condition.
, Long Bearings Take Less Oil
9 With long bearings less oil is col
: sumed. If any one puts a drop Of Q
q or water ON one finger, and rubs
! with another finger quite hard, th
g lubricator will squeeze out OH the sidt
: and run away The friction will the
q produce heat, as there is no more Il
i bricator to prevent it. When this b:
= been tried, adds p Pryibu in PoWe
e put another drop Of oil on the fnge
s but do not press SO hard, and the Il
= bricator will last much longer. Son
3 one may say that a longer bearing wi
e e3use more friction THIN a short on
|, which is not so. It will only happen
e a bearing is too long in proportion
d it's diameter and pressure, but il
i bearing EAs proper length and is col
q tiEuously oiled, it Will take less powi
: than one which is too short and n,