- published: 07 Jul 2016
- views: 45154
The bow drill is an ancient form of drilling tool. It commonly was used to make friction fire, and in this function it also was called a fire drill. However, the same principle also was used widely in drilling for purposes of woodworking and dentistry.
Bow drills were used in Mehrgarh between the 4th and 5th millennium BC. This bow drill—used to drill holes into lapis lazuli and carnelian—was made of green jasper. Similar drills were found in other parts of the Indus Valley Civilization and Iran one millennium later.
The bow drill consists of a bearing block or handhold, a spindle or drill, a hearth or fireboard, and a simple bow. Other early versions of mechanical drills include the pump drill and the hand drill.
The drill offers an ancient method of starting fire without matches or a lighter, a method that applies friction to generate heat. The heat eventually produces an ember in the burnt sawdust. The ember is tiny, smaller than the head of a cigarette, and fragile. Once the ember is formed it is carefully placed into a "tinder bundle" (a bird's type nest of stringy, fluffy, and combustible material). Once the ember is in the tinder bundle it is then carefully nurtured and coaxed into flame. Once the tinder bundle bursts into flame, it is placed into the fuel that has been assembled ready for ignition.
Bow may refer to:
A drill is a tool fitted with a cutting tool attachment or driving tool attachment, usually a drill bit or driver bit, used for boring holes in various materials or fastening various materials together with the use of fasteners. The attachment is gripped by a chuck at one end of the drill and rotated while pressed against the target material. The tip, and sometimes edges, of the cutting tool does the work of cutting into the target material. This may be slicing off thin shavings (twist drills or auger bits), grinding off small particles (oil drilling), crushing and removing pieces of the workpiece (SDS masonry drill), countersinking, counterboring, or other operations.
Drills are commonly used in woodworking, metalworking, construction and do-it-yourself projects. Specially designed drills are also used in medicine, space missions and other applications. Drills are available with a wide variety of performance characteristics, such as power and capacity.
Around 35,000 BCE, Homo sapiens discovered the benefits of the application of rotary tools. This would have rudimentarily consisted of a pointed rock being spun between the hands to bore a hole through another material. This led to the hand drill, a smooth stick, that was sometimes attached to flint point, and was rubbed between the palms. This was used by many ancient civilizations around the world including the Mayans. The earliest perforated artifacts, such as bone, ivory, shells and antlers found, are from the Upper Paleolithic era.
One night as I lay dreaming of pleasant days gone by
My mind was bent on rambling to Ireland I did fly
I stepped on a vision and I followed with the wind,
When at last I came to anchor at the cross of Spancill Hill.
Then on the 23rd of June the day before the fair,
When Ireland's sons and daughters and friends assembled there.
The young, the old, the brave and the bold came their duty to fulfill
At the Parish Church in Clooney a mile from Spancill Hill.
I went to see my neighbours, to hear what they might say,
The old ones were all dead and gone, and the young ones turning grey
I met the tailor Quigley, he's as bold as ever still,
Sure he used to make my britches when I lived in Spancil Hill.
I paid a flying visit to my first and only love,
She's as fair as any lily and gentle as a dove
She threw her arms around me, saying "Johnny, I love you still"
Ah she's Ned, the farmer's daughter, the pride of Spancil Hill
I dreamt I held and kissed her as in the days of yore
"Oh Johnny you're only joking, as many's the time before"
The cock he crew in the morning, he crew both loud and shrill,