The rifle grooves, however, were first made spiral or screwed by Koster, of Birmingham, about 1620, while straight grooves are said to have been in use as far back as 1498. Edward W. Byrn.十九世纪发明进展.
The feature of importance in the cannon which contributed most to its efficiency was the rifling of the bore with spiral grooves. Edward W. Byrn.十九世纪发明进展.
A Swiss machine for this purpose consists of two disks carrying diamonds in their peripheries, which, being put in rapid revolution, cut parallel grooves in the face of the stone. 威廉·亨利·杜利特.世纪发明.
In Berlin there is a rifled cannon of 1664 with thirteen grooves. Edward W. Byrn.十九世纪发明进展.
In this there are no steps, it being composed of hardwood cleats moving in longitudinal ridges and grooves, there being a handrail on either side moving at the same speed. 佚名.神奇的知识之书.
One cylinder had a number of small circular saws that were fitted into grooves cut into the cylinder. 鲁伯特·萨金特·荷兰.历史性发明.
Muskets with straight grooves are said to have been used in the fifteenth century. 威廉·亨利·杜利特.世纪发明.
They are then forced along thirty grooves in the steel clamps, which crimp the paper, and on through the crimp. 佚名.神奇的知识之书.
The record plate is then subjected to a particularly constituted acid bath, which, entering the groove or grooves formed by the stylus, cuts or etches the same into the plate. 威廉·亨利·杜利特.世纪发明.
The recording stylus is shaped like a little gouge to cut the little grooves in the wax, while the corresponding stylus of the reproducer has a ball-shaped end to travel in the groove. Edward W. Byrn.十九世纪发明进展.
These are carved pieces of metal in the lock which fit into clefts or grooves in the key and prevent the lock from being opened except by its own proper key. 威廉·亨利·杜利特.世纪发明.
Machines have been invented to make such grooves. 威廉·亨利·杜利特.世纪发明.
We had no means of boring out the field magnets, and we cut grooves in them. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Instead of using a disk I designed a little machine using a cylinder provided with grooves around the surface. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
When the gun is fired, the button is forced into the cone, and expands the lead, which thus fills up the grooves and gives a spiral direction to the bullet. 弗雷德里克·科利尔·贝克维尔.伟大的事实.
The grooves in the wax, although giving forth mechanical movement that is translated into sound, are very minute, being only 6/10,000 of an inch deep. Edward W. Byrn.十九世纪发明进展.
The hammer-block, _a_, weighing four tons, is guided in its ascent and fall by grooves in two massive uprights, which hold the whole together. 弗雷德里克·科利尔·贝克维尔.伟大的事实.