Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS32983 A
Publication typeGrant
Publication date6 Aug 1861
Publication numberUS 32983 A, US 32983A, US-A-32983, US32983 A, US32983A
InventorsJohn A. Dahlgeen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cast-ibon ordnance
US 32983 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


Patented Aug. 6, 1861.

@@2172 ga/aga.- o A UNITED STATES OFFICE.



Specification of Letters Patent No. 32,983, dated August 6, 1861.

T o all 'whom 'it Amay concern.:

Be it known that I, .loi-IN A. DAHLGREN, of the city and county of Philadelphia, in the State of Pennsylvania, have invented a new Forni for Cast-Iron Ordnance, which consists in so shaping the gun as to dispose all the metal available for the purpose about the part where the greatest if not the whole force of explosion is exerted when the gun is discharged, whereby I am enabled with a. given quantity and quality of iron to make cannon which shall throw heavier' projectiles and a greater aggregate weight of them than cannon constructed by the rules hitherto practiced.

In the accompanying drawings, Figure 1 represents a side elevation of a gun constructed in the improved form invented by me, and Fig. 2, represents a longitudinal section of the same.

For convenience of description I have divided the gun into four sections bounded as shown by the lines 1, 2 and 3 in Fig. 2. The part between the end of the breech and the line 1, I call the breech. The part between the lines l and 2 I call the fort. The part between the lines 2 and 3, I call the junction; and the part between the line 3 and the muzzle, I call the chase. of measurement which I have employed for the construct-ion of the gun is the diameter of its bore,-or, as it is generally called, the caliber of the gun; and however large or small may be the piece of ordnance which it is required to construct, the dimensions'of its several parts will be expressed in multiples or fractions of its own caliber corresponding to the proportions of the gun laid down in F ig. 2, whose dimensions at important parts are denoted in units of length equal to its own caliber.

Provided that, the quantity of powder with which the new gun is to be tired bears the same relation to the weight of its projectile that exists betwen the powder and projectile for which the gun shown in Fig. 2, is designed; the proper weight of the projectile for which is a shell or hollow spher ical ball, about three quarters of the weight of a solid spherical ball of the same caliber to be tired with about one-seventh its weight The unit of powder. For example, it is required to make a cannon having abore eight inches in diameter; the following dimensions are ob- By the same rule also the weight of the projectile and of the powder would be as follows, vizz Shell, empty 70 lbs. Powder A 10 lbs.

If however the weight of the charge of powder is to be materially less than one seventh to that of the shell or other projectile, then the diameters at 1 and 2 may be reduced to 2.909 calibei's, and the length of breech to 1.455 calibers, and the breech may have an ellipsoidal instead of a spheroidal form. In like manner the dimensions in calibers of all the other parts may be obtained by measuring the drawing in Figj2.

In smooth-bored cannon the form of the breech may be hemi-spherical, hemispheroidal or ellipsoidal as greater or less strength is required. Strictly speaking, the surface of the fort should be curvilinear longitudinally as well as transversely. But4 as artillerists insist on the importance of having the means of taking a direct level aim for point blank tiring, in case of injury to the sights, the fort of the gun. represented in the drawings is made cylindrical the diameter being for that purpose slightly reduced between the points 1 and 2. Another deviation from strict theoretic proportions is produced by a swell about the muzzle, chiefly to protect it from liability to frac- CIL ture by being struck against, or by, hard bodies: this swell also answers another purpose especially useful on board ships of giving a hold for a lashing in case the gun is housed. v

The trunnions and other projections may be cast on, in the usual Way, but. the strength of the gun will be much increased if it is cast Without them; and they can be attached subsequently by a method., a more particular description of Which is given in another patent granted to me and bearing even date herewith.

That claim` as my invention and desire to secure by Letters Patent, isp A caste-iron gun constructed substantially according to the rule herein described; whereby the quantities of metal disposed in the different parts of the gun are proportionate, or nearly so, to the relative degrees of strain exerted by the force of the eX- ploded charge at those parts respectively. JNO. A. DAHLGREN. lVitnesses JNO. D. BRANDT, A. B. N oR'roN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4906244 *24 Jul 19896 Mar 1990Cordis CorporationBalloons for medical devices and fabrication thereof
US5156612 *2 Aug 199020 Oct 1992Cordis CorporationBalloons for medical devices and fabrication thereof
US5565523 *7 Jun 199515 Oct 1996Advanced Cardiovascular Systems, Inc.Polymer blends for use in making medical devices including catheters and balloons for dilatation catheters
US5747591 *31 Oct 19965 May 1998Advanced Cardiovascular Systems, Inc.Polymer blends for use in making medical devices including catheters and balloons for dilation catheters
US6024722 *27 Dec 199415 Feb 2000Scimed Life Systems, Inc.Thermoplastic polyimide balloon catheter construction
US6024752 *11 May 199815 Feb 2000Scimed Life Systems, Inc.Soft flexible tipped balloon
US6093463 *20 Mar 199825 Jul 2000Intella Interventional Systems, Inc.Medical devices made from improved polymer blends
US6099926 *12 Dec 19978 Aug 2000Intella Interventional Systems, Inc.Aliphatic polyketone compositions and medical devices
US6110142 *3 Mar 199829 Aug 2000Cordis CorporationBalloons for medical devices and fabrication thereof
US6146356 *27 May 199914 Nov 2000Scimed Life Systems, Inc.Block copolymer elastomer catheter balloons
US6165207 *27 May 199926 Dec 2000Alsius CorporationMethod of selectively shaping hollow fibers of heat exchange catheter
US82063723 Jun 201026 Jun 2012Boston Scientific Scimed, Inc.Catheter with spiral cut transition member
US905044222 Jun 20109 Jun 2015Atrium Medical CorporationExpandable fluoropolymer device for delivery of therapeutic agents and method of making
US20010043998 *20 Jun 200122 Nov 2001Chen John JianhuaDimensionally stable balloons
US20020163104 *26 Mar 20027 Nov 2002Tom MotsenbockerBalloon folding technology
US20030167034 *3 Jul 20024 Sep 2003Balding David P.Automatic fever abatement applications
US20040078052 *21 Oct 200222 Apr 2004St. Pierre Ernest J.Multilayer medical device
US20040093720 *21 Jul 200320 May 2004Tom MotsenbockerStent crimping method
US20050244533 *13 Jul 20053 Nov 2005Tom MotsenbockerBalloon folding technology
US20050275140 *13 Jul 200515 Dec 2005Tom MotsenbockerBalloon folding technology
US20070083188 *17 Feb 200612 Apr 2007Axel GrandtCatheter having overlapping stiffening members
US20100241154 *3 Jun 201023 Sep 2010Boston Scientific Scimed, Inc.Catheter with Spiral Cut Transition Member
DE4480681C2 *20 Oct 199427 Sep 2001Scimed Life Systems IncVerfahren zur Herstellung von Katheter-Ballonen und danach hergestellte orientierte Ballone
Cooperative ClassificationY10S428/91, F41A21/28