Shooting a blunt arrow from a seventy-five pound bow at a white pine board an inch thick, the shaft will often go completely through it. A broad hunting head will penetrate two or three inches, then bind. But the broad-head will go through animal tissue better, even cutting bones in two; in fact, such an arrow will go completely through any animal but a pachyderm.
To test a steel bodkin pointed arrow such as was used at the battle of Cressy, I borrowed a shirt of chain armor from the Museum, a beautiful specimen made in Damascus in the 15th Century. It weighed twenty-five pounds and was in perfect condition. One of the attendants in the Museum offered to put it on and allow me to shoot at him. Fortunately, I declined his proffered services and put it on a wooden box, padded with burlap to represent clothing.
Indoors at a distance of seven yards, I discharged an arrow at it with such force that sparks flew from the links of steel as from a forge. The bodkin point and shaft went through the thickest portion of the back, penetrated an inch of wood and bulged out the opposite side of the armor shirt. The attendant turned a pale green. An arrow of this type can be shot about two hundred yards, and would be deadly up to the full limit of its flight.
The question of the cutting qualities of the obsidian head as compared to those of the sharpened steel head, was answered in the following experiment:
A box was so constructed that two opposite sides were formed by fresh deer skin tacked in place. The interior of the box was filled with bovine liver. This represented animal tissue minus the bones.
At a distance of ten yards I discharged an obsidian-pointed arrow and a steel-pointed arrow from a weak bow. The two missiles were alike in size, weight, and feathering, in fact, were made by Ishi, only one had the native head and the other his modern substitute. Upon repeated trials, the steel-headed arrow uniformly penetrated a distance of twenty-two inches from the front surface of the box, while the obsidian uniformly penetrated thirty inches, or eight inches farther, approximately 25 per cent better penetration. This advantage is undoubtedly due to the concoidal edge of the flaked glass operating upon the same principle that fluted-edged bread and bandage knives cut better than ordinary knives.
In the same way we discovered that steel broad-heads sharpened by filing have a better meat-cutting edge than when ground on a stone.
In our experience with game shooting, we never could see the advantage of longitudinal grooves running down the shaft of the arrow, such as some aborigines use, supposed to promote bleeding. In the first place these marks are inadequate in depth, and secondly it is not the exterior bleeding that kills the wounded animal so much as the internal hemorrhage.
A sufficiently wide head on the arrow cuts a hole large enough to permit the escape of excess blood, and, as a matter of fact, nearly all of our shots are perforating, going completely through the body.
Conical, blunt, and bodkin points lack the power of penetration in animal tissue inherent in broad-heads; correspondingly they do less damage.