42 rnnnnan nmroarmn. .
ployment of other properties of the hydrate of alumina. That the
respondent was the first discoverer of this process does not seem at
first to have been doubted. His proposition to obtain letters patent
was, to say the least, not discouraged by Mr. Damon, who was aware `
of it; and the counter-claim of Damon & Bihn does not ap-
pear to have been suggested until the respondent declined to transfer
his rights to the salt company.
As remarked at the outset, the only question requiring our con-
sideration is that of priority. The justice or injustice of the respond-
V ent’s taxing the salt company, if he proposes to do so, for the use of
a process disclosed by experiments made at its request and expense,
_ with its material, while in its employment, we cannot enter upon.
Wan: v. Nomru Cmcseo Rename Mmr. Co. -
(Circuit Court. N. D. Illinois. October, 1880.)
Pa.-mms rox Invsmrcus-Dsvririou.
In reducing his patent to practical application a pateutee is not bold to
strictly and entirely follow the mere mechanical device shown in his drawings,
but he may deviate so long as he does not violate thc principle involved in his
patent. 4 _
In Equity.
J. H. Raymond, for complainant. —
George Willard, for defendant. ‘ i A
Bnonomrr, D. J. The complainants device differs from the Pul-
ver patent by the addition of stationary comb-grates, as he calls
them, which operate with the rocker-grates. The Purchase patent
shows a series of rocker-grates, each of which is rocked or tilted
independently of the others; and the end rocker has grate-bars only
on one side of the rocker-shaft, the shaft lying close to the end of
the nre-box, and so constructed, with an eccentric upon the side next
to the wall of the fire-box, that it can only tilt the grate-bars upward.
For all practical purposes the grate-bars in the end shafts are sta-
tionary when the shaft is not itself rocked. The bars of the shaft
next this end shaft engage and operate with those of the end shaft
precisely in the same manner as in the Bounds grate.
. I have here a model of the Rounds grate, showing the combgrates
at the ends of the hre-box, and the rocking-grate bars engaging