US270101A - Tiioksten nokdenfelt - Google Patents

Description

(Nu Model.)

T. NORDENPBLT.

PROJBGTILB. No. 270,101. Patented Jan. 2, 1'883.

UNITED STATES PATENT, OFFICE.

'IIIORSTEN NOBDENFELT, OF WESTMINSTER, ENGLAND.

DROJ ECTILE.

SPECIFICATION forming part of Letters Patent No. 270,101, dated January 2V, 1883.

Application filed September Il, lBPQ. (No model.) Patented in England February 23, 1852, No. S91. and in France May iti, IPFE,

N0. 149,00. Y l

To all whom it may concern:

Beit known that I, THoRsTEN Nonnnnret'r, a subject of the King ofSweden, residingat 53 Parliament Street, inthe city of Westminster, England, have invented acertain newand useful Improvement in Projectiles, (for which I have received Letters Patent in Great Britain, No. 891, dated 23d February, 1882, and in France, No. 149,008, dated 16th May, 1852,) of which the following is a specification.

The object of my invention is toimprove projectiles of iron or steelsuch as are coated or covered with a solter metal-for'the following special purposes: first, to prevent by means ofthe softer metal the hard projectile from dam aging or wearingout the grooves of the, riding; second, to use a projectilecloserup to thegage of the caliber ofa gun than can bedone it'the hard metal is without such softer covering, as theprojectiles might stick in the bore and cause an explosion; third, to insure better centering ofthe projectile in the bore, and consequently a steadier flight through the air, than cati be attained with the larger play, which is necessary if theprojectileis not covered with softer metal; fourth, to give required rotation to the projectile by means of the softer-tnetal covering by letting it into the grooves of the riding. In order to do this, I make thc part or parts of the surface of theiron or steel projectile which have to be coated with the softer metal sntliciently even or polished, and I clean theseparts by dipping the projectile into acid. rI`hen l insert the projectile into a bath of copper or tin, and apply electricity from a galvanic battery or from an electrical machine. By this means I cause copper or tin to be deposited ou and to adhere to the surface of the projectile to the desired thickness. 'lo cause the coating of copper or tin to give rotation to the projectile, I make it thicker in one or more parts of the projectile than in the other parts; or I put a. disk or one or more rings of copper or brass round the projectile of such a diameter as to tll up the bore completely, and thenput on the coating over this disk or rings by means ofthe copper or tin bath. The coating put on in the copper or tin bath assists in fixing this disk or rings onto theprojectile. lfI wish toputapartial coveringA only onto the projectile, I cover parts than in othersl putthe coating ou first of f therequired thickncssoverthewhole projectile or over the parts which I wish to have thinly covered. 'Ihen I ptit varnish over the parts I wish thinly covered, and put the projectile again into the electrical bath and apply a thicker covering tu the uitvarnished parts.

Iuorderthat my said invention may be most fully understood and readily carried into effeet, I will proceed to describe the drawings hereunto annexed.

In the drawings, Figure l is a longitudinal section ofau iron orsteel projectile coatcdwith copper or soft metal in accordance with my in vention. a is the body of the projectile. bis a cup ot' the sol'ter metal deposited upon or applied to the base ofthe projectile. It is intended to take the rifing and impart rotation as the projectile travclsalong the barrel. c is a covering ofthe solter metal applied overthe cup. lf it be desired to produce the cup b by deposition from n coating-bath, the projectile, having been thoroughlycleaned, is immersed inthe coating-bath to the depth to which itis desired that the deposit should extend, the electrical connections are made, and the metal deposited from the solution until itattainsthc requisite thickness; orthe surface maybe varnished. excepting those parts ou which the cup is to be produced, and then theprojectile may be more deeply immersed in the coatingbatl|. When a cup of the desired thicknessis formed the projectile is removed from the bath and the varnish is thoroughly cleaned oli` before the nextoperation or, in place ofproducing the cup byelectrical deposition, a cup of the softer mctal,produced by castingorstamping, may be forced onto the base end ofthe projectile. The cup having been formed or applied, the outer covering, c, is then produced over it by electrical deposition, as already described in rc spect to the cn p b. Thecoveringcextendsovcr all the parts ofthe projectile which can come into Contact with the interior of the barrel.

Fig. 2 represents a section of a projectile in IOO which :ibase-cup is not employed; butin place thereof there nre ring ot' the softer inetnl to luke the riding. d d are these rings. They indy be produced by electric deposition, while the other parte ofthe surface ot' the projectile ure covered with varnish; or they may berings cut from n tube of the softer metal .1nd forced onto the body ot' the projectile. The outer covering, c, is produced over the rings, as already described.

Fig. 3 is a. section of :i projectile similar to that shown by Fig. 2, but furnished both with base-cup and ring.

Fig. 4 is a Section of :t projectile which has lirst receiveda thin coatingot' the softer metal by electrical deposition snilicientto protect the projectile from rust, and which has then been provided with n base-cup1 b,and an outer covering, c, hy the means already described.

Having thus described the natureofiny said invention and the manner of performing the saine, I would haveit understood thatIelaim- A hard-metal projectile provided with the soft-metal buse-cup or specitied equivalent thereof, and with the outer envelope or cover- 25 ing of soft metal, as und for the purpose described.

" THORSTEN NORDENFELT.

Witnesses:

G. W. WESTLEY, WALTER J AMES SKERTEN. Both of 17 Gracechurch Street, London.

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