w how little attention is paid to the internal condition of
boilers by incompetent engineers, we copy the following from a letter
of one of our inspectors:

"In one tubular boiler I found sediment in the back end, eight inches
deep, and extending forward more than four feet. It seemed to be an
accumulation of fine scale cemented together, so that it was necessary
to break it up with a hammer and chisel before it could be removed.
The engineer said _he had cleaned the boilers only three days before_,
and objected to my making another examination. This is one of the
many cases we find, where the proprietor trusts everything about his
boilers to his engineer, supposing him to be reliable."

With such accumulation of sediment and deposit, is it any wonder that
sheets are burned? A careful engineer will understand, if the feed
water be impure, that he must blow down two or three inches every day,
or oftener, that the sediment may be removed as it accumulates, and
then an internal examination once in two weeks, or once a month, will
insure a clean boiler.

Cases of external corrosion, 26--10 dangerous; cases of internal
corrosion, 17--5 dangerous; cases of internal grooving, 28--11
dangerous; water gages out of order, 50; blow-out apparatus out of
order, 15--7 dangerous; safety valves overloaded, 40--12 dangerous;
pressure gages out of order, 54--6 dangerous, varying from -15 to
+8 pounds. (We have found several gages entirely ruined from being
frozen). Boilers without gages, 4; cases of deficiency of water,
5--1 dangerous; broken braces and stays, 31--7 dangerous; boilers
condemned, 2--both dangerous.

Two engineers were found drunk on duty, and promptly discharged. There
were 9 serious explosions during the month, by which 99 persons were
killed, and 6 wounded. Eighty-seven of the killed were passengers on
the ill-fated steamer _H.R. Arthur_, on the Mississippi River. Many
were drowned, and some burned, but the origin of the calamity was the
bad quality of the boilers, which a careless management was unable
to detect. The upper and fore part of the boat was blown away by the
exploded boilers, and, to add to the horror, what remained took fire.

None of these exploded boilers were under the care of this company.

* * * * *

Five ore-roasting furnaces are in full blast in Nevada.

* * * * *

IMPROVED COMPOUND SPIRAL CAR SPRING FOR RAILWAY CARRIAGE