264 .Mechanics, Physics, and Chemistry.

stood a few years since, when the subject was under discussion, but which latterly seems not Io have received much considerati(m.

We allude again to this ele[nent in our subject of investigation, be- causelheexperimenlswhich are the last mentioned in M. Chevreul,s paper, appear to be not unconnected with the end to which the discove. ries of' chemistry will, we hope, one day reach. On this point we hope to offer some suggestions.

For the Journal of the Franklin Institute.

Storm's Cloud l'hzgine.--Correction of Error. To the Committee on Publications.

G1.:wrLnm,:s~My attention has been called to an article up~m "Storm's Cloud Engine" in the August number of your Journal, in which a state- merit is made, that in justice to myself and others should be corrected.

I refer to that portion of lhe editorial remarks which states that "the experiments, alluded to in the conch,ling paragraph, were conducted, we believe, under the superin'endence of Cha, les W. Copeland." This is an e r ro r .

No experiments producing such results as those stated were conducted by me. t,'xperin, ents had been made by others, in which some such amount of gain (about 60 or 80 per cent.) was reporled.--It is true ~hat I have been conducting a series of experiments, but the resuhs have not yet been reported on to the Company, (except verbally;) in fact, the whole series tins l~ot yet been completed. Preparations are now being made for that purpose.

CHARLES W. COPELA~D.

For the Journal of the Frankl in Institute.

Consumpllon of Fuel by the Steamer Ericsson in a Voyage from Ilavre to ,New York.

We publish the following memoranda of the consumption of fuel by the steamer Ericsson, in a late voyage from Havre to New York. The weather for the grealer part of the trip xn, as very unfavorable, the wind being ahead and the sea very rough, and the wheel of the steamer was so defective as to give but little increase of speed when the number of revolutions was increased front 10 to 15 per minute ; yet we consider the economy of fuel so remarkable as to deserve a permanent record. They are copied from tile daily official reports of lhe Engineer.

The Ericsson is 260 feet long and 40 in maximum breadth; draft loaded, 18 feet. Tonnage, 2003. The engine consists of 2 inclined cylinders, 6"2 inches diameter, 7 feet 10 inches stroke. The boilers are of an oval form, 17× 14× 10 feet. The condensers are on a plan pa- tented by Captain Ericsson, and furnish hot fresh water to the boilers. The wheels are 3"2 feet in diameter, I0 feet on the face and dip when the "~essel is loaded 5 feet.