applications to be divisions of the application filed January 26, 1880, the parent case, which, for convenience, will hereafter be referred to as "Case A." The drawings in all of these cases show substantially the invention described and illustrated in Case A, and the claims in each of the cases filed July 19, 1882, will be given. The applications filed July 19, 1882, are numbered 67,135, 67,136, 67,137, and 67,138, and are designated, respectively, as "Case B," "Case C," "Case D," and "Case E."

The claims in Case B are as follows:

1. The combination of the moving cloth, the blast-chamber or conduit through which air is guided to said cloth, and the dead-air chamber, entirely cut-off from said blast-chamber or air-conduit, to receive the dust, substantially as set forth.

2. The combination of the rotating cloth, the blast-chamber or air-conduit, the dead-air chamber, entirely cut off from the air-conduit, aud provided with an orifice independent of the blast-chamber or air-conduit for the discharge of the collected dust, substantially as set forth.

3. The combination of a dead-air chamber, parti-cylindrical cut-off walls, and an air-conduit or blast-chamber, arranged substantially as set forth, to force the air through the cloth on substantially radial lines on all sides of the axis of the reel. except where the said cut-off walls are.

4. The combination of a rotating reel, a collecting-cloth thereon, a blast-chamber or air-conduit through which dust-laden air is forced against the cloth, a dead-air chamber entirely cut off from the blast-chamber or air-conduit, and provided with a discharge or emptying opening separate from said blast-chamber or air-conduit, means for dislodging the dust from the cloth into said dead-air chamber, and a positivelyacting mechanism for carrying the dislodged dust to said opening, substantially as set forth.

5. The combination of a rotating reel, a filtering-cloth carried thereby, means for carrying a dust-laden air-current against said cloth, mechanism adapted to dislodge the dust from the cloth, a still-air chamber below said dislodging devices through which the dust drops without contact with the air-current, the cut-off surfaces concentric with the reel, the longitudinal peripheral cloth-supporting ribs, and the flexible air-stops attached to said ribs, substantially as set forth.

The following reservation clause appears in this case:

I do not in this application claim anything but what is specifically set forth in the following claims, reserving to myself the right to claim any other patentable matters which I have herein shown and described in another application that I have filed heretofore and of which this is a division.

The claims in Case C are as follows:

1. In a dust-collector, the combination of the following elements, viz: a stellated reel rotating about a horizontal axis and provided with a central opening for the exit of air, an inclosing-casing provided with an opening corresponding to the central opening in the reel, and a fan mounted on the casing, the eye of the fan being arranged to communicate directly with the air-opening in the casing and in the reel head, substantially as set forth.

2. In a dust-collector, the combination of the following elements, viz: a stellated reel adapted to rotate around a horizontal axis and provided with a central opening for the exit of air, an inclosing-case provided with an air-opening corresponding with the opening in the reel, a fan mounted on the casing, the eye of the fan being arranged to communicate directly with the air-opening in the casing and in the reel, and a cutoff adapted to isolate portions of the stellated reel, substantially as described.

3. In a dust-collector, the combination of the following elements, viz: a stellated

reel adapted to rotate around a norizontal axis and provided with a central opening for the exit of air, an inclosing-casing provided with an air-opening opposite to the opening in the reel, a fan mounted on the casing, the eye of the fan being arranged to communicate directly with the air-openings in the casing and in the reel, a cut-off adapted to isolate portions of the stellated reel, and a conveyer arranged below the reel to receive dust from the isolated portion of the reel, substantially as set forth. 4. In a dust-collector, the combination of the following elements, viz: a stellated reel rotating about a horizontal axis, a cut-off adapted to isolate portions of the stellated reel, a conveyer below the reel to receive dust from the isolated portions of the reel, and mechanism connecting the conveyer with the reel for imparting a rotary movement to the reel, substantially as set forth.

5. In a dust-collector, the combination of the following elements, viz: a stellated reel adapted to rotate aronnd a horizontal axis and provided with a central opening for the exit of air, an inclosing-casing provided with an air-opening corresponding to the opening in the reel, a cut-off adapted to isolate portions of the stellated reel, a conveyer arranged below the reel to receive dust dislodged from the isolated portions of the reel, and a jarring mechanisin actuated by the conveyer for removing dust from the isolated portions of the reel, substantially as set forth.

The following reservation clauses appear in this case:

I do not hereby claim any of the features other than those specifically set forth in the claim, reserving to myself, however, the right to claim the other generic and specific patentable matter which I have shown in another application which I have filed, Serial No. 1,428, filed January 26, 1880, of which this is a division.

I do not limit myself to all the parts in detail which I have shown, as it is apparent that some of the novel features illustrated and described may be separated from the others and combined with the other devices without departing from the spirit of my invention so far as it relates to the portions that are separable. Thus it will be seen that the knocking or hammering devices for dislodging the dust will operate more advantageously than the devices used heretofore, whether or not they be combined with these specific forms or devices for cutting off the air, which I have shown or combined with this specific form of cloth-support. So, also, the advantages incident to supporting the inside cut-off stationarily [7] relatively to the revolving parts are attained irrespective of employment therewith of the outside abutment.

The claims in Case D are as follows:

1. In a dust-collector, the combination of the following elements, namely: an inclosing casing, a rotating filtering-reel arranged therein to move around a horizontal axis, and a stationary cut-off arranged within the reel and supported independently of the reel upon a stationary support, substantially as set forth.

2. In a dust-collector, the combination of the following elements, namely: an inclosing casing, a filtering reel having a zigzag surface inclosed within the casing, and a cut-off arranged within the reel and below the center of the reel, a suction-fan, and air-trunk connecting the fan with openings in the reel-heads, substantially as set forth.

3. In a dust-collector, the combination of the following elements, namely: an inclosing-casing, a filtering-reel, mechanism acting upon the reel-heads within the casing to rotate the reel, a cut-off for isolating portions of the filtering-surfaces alternatively, and a jarring mechanism for dislodging the dust from the isolated portion of the filtering reel, substantially as set forth.

4. In a dust-collector, the combination of the following elements, namely: an inclosing-casing, a rotating filtering-reel having zigzag surfaces, mechanism acting upon the reel-heads within the casing to rotate the reel, a cut-off arranged inside of said reel for isolating portions of the filtering-surfaces alternatively, and a jarring mechanism for removing the dust from the isolated portion of the filtering-reel, substantially as set forth.

9373 PAT- 4

5. In a dust-collector, the combination of the following elements, namely: an inclosing-casing, a rotary reel inside of the casing, the tubular bearings for the ends of the reel, whereby it may be mounted without a through-shaft, and a cut-off inside and supported independently of the reel, substantially as set forth.

6. In a dust-collector, the combination of the following elements, namely: an inclosing-casing, a rotating filtering-reel in said casing, hollow trunnions for mounting said reel, communicating with the interior of the reel, and a suction-fan adapted to draw air from the casing into the interior of the reel through the filtering material and out of said reel, substantially as set forth.

7. In a dust-collector, the combination of an inclosing-casing, a zigzagged shaftless rotating reel, a fan moving air into the reel through the cloth and outward axially, a fixed cut-off placed on the inside of the reel so as to intercept the inflow of air through a part of the zigzagged sections, and a trough placed under the isolated sections to receive the dust dislodged from such sections, substantially as set forth.

The following reservation clauses and comprehensive statements appear in this case:

I do not herein claim any of the features other than those specifically set forth in the claim, reserving to myself, however, the right to claim the other generic and specific patentable matters, which I have shown in another application, which I have filed, Serial No. 1,428, filed January 26, 1880, of which this is a division.

I do not limit myself to all the parts in detail which I have shown, as it is appar ent that some of the novel features illustrated and described may be separated from the others and combined with other devices without departing from the spirit of my invention so far as it relates to the portions that are separable. Thus it will be seen that the knocking or hammering devices for dislodging the dust will operate more advantageously than the devices used heretofore, whether or not they be combined with these specific forms of devices for cutting off the air which I have shown, or combined with this specific form of cloth-support. So, also, the advantages incident to supporting the inside cut-off stationarily [?] relatively to the revolving parts are attained irrespective of employment there with of the outside abutment.

The means for evenly distributing the air by suction over the collecting-surface from end to end of the reel can be applied advantageously to reels bearing [differing !] somewhat from the specific character shown.

As revolving reels without central shafts and radial arms have been mounted in many ways now well known, by constructing them with heads adapted to rest and rotate directly upon the bearings of the reel, I wish it understood that I do not limit myself to the specific form of reel-mounting of this class which I have shown, for, when combined with an air-tight casing and the other devices set forth, a mounting of a modified form could be employed to similar advantage.

One feature which distinguishes my invention from those which have preceded it is the method of supporting the reel-heads which have central openings, directly upon the stationary bearings, instead of upon a central reef-shaft which rotates with the reel, and wherever in this case I refer to a reel having heads at its ends resting upon bearings, I mean reel-heads which engage directly with the reel-supports and rotate relatively thereto.

I have shown in the drawings the machine constructed with one of its tubular bearings communicating with the fan, also another organization in which both the hollow trunnions are connected with the fan-case. I therefore desire to be under. stood that in claiming the hollow trunnions, I wish to cover as well the structure shown where both trunnions are hollow as the one where only one of the trunnions connects with the fan. In the latter case it of course is not important that the other trunnion should be open.

Case E has but one claim, as follows:

The combination of mechanism for conducting a blast against and through a screen, mechanism for isolating a portion of said screen, mechanism for jarring said isolated

portion, and mechanism for isolating the substances thus separated from the blast and conducting them away from the influences of said blast, all substantially as shown and described.

The following reservation clause appears in this case:

I do not in this application claim anything except what is specifically set forth in the following claims, reserving the right to claim the other patentable matters which I have shown in another application of which this is a division.

June 14, 1883, Holt filed another application, declaring it to be a still further division of the application filed January 26, 1880. This case is No. 98,094, and, for convenience, will be referred to as "Case F." The claim in this case is as follows:

In combination with the still-air chamber and the moving cloth of a dust-collector, the conveyer E, substantially as set forth.

The following reservation clause appears in this case:

It is not intended in this application to cover all the inventions disclosed in the drawings, because other parts thereof have been made the subject-matter of other applications which I have filed; but in this case I propose to limit myself to the inventions specifically recited and covered by the claims hereof, reserving to myself the right to claim all other patentable inventions shown or described in the other applications.

Shorn of verbiage and devoid of anything like magniloquence, the claims in these cases are found to be as follows:

In Case A, claim 1 covers the reel, the dust-box underneath, and the knocker, and there is an indistinct allusion to some sort of verticalchamber mouth not directly brought into the combination. Claim 2 covers the reel, the dust-box underneath, the knocker, and a cut-off (probably the inner cut-off). Claim 3 covers the reel, the dust-box underneath (in the indefinite expression "mechanism for collecting"), the knocker (in the indefinite expression "mechanism for detaching"), the cut-off, the inclosing-case, and the conveyer (the last in the indefinite expression "mechanism for carrying away the dust"). Claim 4 covers the reel with an open head (it would be inoperative without such) upon a hori zontal shaft (an alternative construction to that named in claim 5, in which the reel rotates on its ends without a through-shaft), the inclosing-case, and a suction fan. Claim 5 covers the reel, the inclosing-case, and tubular bearings around hollow trunnions in the heads, the latter elements constituting a construction alternative to, or which may supplant, that named in claim 4. Claim 6 covers the reel (not now desig nated by the expression "stellated," but described as being made up of heads and inner and outer series of cloth-bars and the cloth), the cut-off, the inclosing case, the fan, and the contracted housing below the reel (this last being probably indicated in the expression "partitions below the reel"). Claim 7 covers the reel as we see it, the casing, the tubular bearings, and, probably, the contracted housings.

In case B, claim 1 covers the moving cloth (which indicates a construction alternative with the moving reel in the other case), the inclosing-case (now turgidly denominated a "blast-chamber"), and the

still-air chamber (surely implied in the other case in those claims in which the contracted housings are named, for the very purpose of the contracted housings is to get the so-called "still-air chamber"). Claim 2 covers the cloth, the inclosing-casing or "blast-chamber," and the dead-air or still-air chamber (the combination being the same, it being now only furthermore explained that the still-air chamber must have a discharge, without which it would be useless). Claim 3 covers the dead-air chamber, the contracted housings, and the inclosing casing (denominated a "blast-chamber," and said to be "arranged to force the air through the cloth on substantially radial lines on all sides of the axis of the reel, except where the housings are," whereas nothing is named in the claim which will do any forcing, and the claim is to an inoperative aggroupment, the reel not being brought in). Claim 4 covers the reel, "the collecting cloth thereon" (by the reel, "the collecting-cloth thereon" is understood, and naming the reel separately makes this claim alternative with claims 1 and 2 of this same case), the inclosing-casing, the dead-air or still-air chamber having its discharge, the knockers (supposed to be intended in the indefinite expression "means ford islodging the dust from the cloth"), and a conveyer (supposed to be intended in the indefinite expression "a postively-acting mechanism for carrying the dislodged dust to said opening," which is wrong, besides, because it should be from said opening). Claim 5 covers the reel, the cloth (independent of it), the fan, and the inclosingcasing (the last two being supposed to be covered by the indefinite expression" means for carrying a dust-laden air-current against said cloth"), the knocker (supposed to be intended in the indefinite expression "mechanism adapted to dislodge the dust from the cloth"), the still-air chamber, the contracted housings, and the internal cut-off as well (both cutoffs being supposed to be involved in the expression "the cut-off surfaces concentric with the reel "), and a packing on the bars of the reel. In Case C, claim 1 covers the reel, the casing, and the fan-nothing more. (It is true that certain explanations are made, perhaps intended as limitations; but they might as well have been omitted, for they are understood, inasmuch as without them the parts would be absolutely inoperative. Thus it is explained that the reel is on a horizontal axis and has a central opening for the exit of air, that the inclosing-case is provided with an opening corresponding to the central opening in the reel, and that the eye of the fan is arranged to communicate directly with the air-opening in the casing and in the reel-not, for example, with the outside of the casing or with some other part where it would be independent, and thus abosolutely useless.) Claim 2 covers the reel having the same understood essentials, the casing having the same extraordinary provisions, the fan also unexpectedly provided with conditions to make it operative in its situation, and a cut-off (whether the inner cut-off or the outer cut-off the public is not here informed). Claim 3 covers the reel, the inclosing-casing, the fan, the one cut-off or the