American watchman and Delaware advertiser. [volume] (Wilmington, Del.) 1822-1828, 1824-06-22
WILMINGTON, TUESDAY, % JUNE, 1924.

| Mr. Mitchell, dyer, Port street, Stirling, has been
IN the practice, for many years. of having the oper
alton OF grinding his indigo, performed by dog.
1he machine is extremely simple, and seems fully
adequate TO the purposes intended. 1t consists of
large wheel about "a feet in circumference and S
inches broad. This wheel is connected with me-
tai vessel in which the indigo is placed, and three
lSb. shots all OF which the dog puts in motion when
necessary. This Is performed by his entering the
wheel the breadth OF which, Is inches, gives him
ample space. lie commences slowly at FIRST by
throwing his feet forward as in the act of running
Ills weight in this manner acts as lever ON the
axle OF the wheel, and the action of going round,
having once commenced, which is soon done, he
increases its rapidity to an astonishing extent, BY
increasing the quckness of his pace which at times
IS carried so far as TO exhibit him as f at his utmost
Ispeed. In this way he has much more command
over the wheel than the stoutest could by means
OF handle attached to the axle in the ordinary way
IL is curious fact that in his usual mode OF work
ing, ne has regular pace, which he maintains with
lease, but no sooner does he see stranger look on
than, as II DESTROYS of exciting admiration he in.
icreases his exetions to such degree that it would
lDe impossible for him to continue them at the same
rate for any length of time. Lion the present work
man, is stout handsome dog, and commenced his
labouls about year ago, when it was found neces
sary to place MATCH, his predecessor, On the retired
list that faithful servant having performed the du
ties OF his office Tor years-CaedoniaR Mercury
Explosion Of Steam BoiLer.--O One of the most
tremendous explosions from steam upon record,
took place at distillery at Lochrn in Scotland.
1 he boiler was intended to furnish steam OF high
pressure for boiling the large stills OF the establish
ment; II measured 81 feet in length, feet in
breadth at the bottom, feet Immediately under the
ltop, and about feet in height the bottom forming
Ia semlcircle, rose into the body OF the boiler. Its
whole weight was tons, OF which the top and sides
were estimated at tons This portion ofthe boiler
was torn from the bottom by the explosion it dash
ed aside an srched covering OF brick work, pene-
trated the root of the boiler house, rose in the al
mosphere to the height Of seventy feet, and then
descended at distance of $50 feet, aghted on the
roof OF another building, carried every thing before
it IN IFS fall, and even crushed in pieces one side Of
large circular vat Of cast iton. The lives of two
Workmen only were destroyed, although the whole
establishment was crowded with people at work.
The engine at the time OF the explosion was sup
posed TO be at work with pressure on the safety
valve OF only 40 pounds to the square inch This
pressure might perhaps, by some mismsDagement,
have been greatly increased Yet no p obable in.
crease OF this pressure will altogether account for
the force OF the explosion, since, calculate from
the impetus with which the weight OF seven tons
was projected, the impulse given by the explosive
force could not have been less than 215 pounds
upon the square inch. 1t seems most probable that
the immediate Of the accident, was the undu-
lily heated state of the end of the boiler next the
feeding pipe; that there was defect in the supply
of water by which this part was suffered to become
red hot and that consequently upon the sudden adj
mission OF jet OF water there an exricaton Of
greater quanty Of steam than could be let off by
the safety valves in TO relieve the walls of
the boiler from its pressure.