At the extremities it has legs, made exactly alike and jointed on perpendicularly to the extremities of the straightedge, and also crosspieces, fastened by tenons, connecting the straightedge and the legs.
The chorobates is a straightedge about twenty feet long.
When the straightedge is in position, and the plumblines strike both the lines alike and at the same time, they show that the instrument stands level.
These crosspieces have vertical lines drawn upon them, and there are plumblines hanging from the straightedge over each of the lines.
This clay is as easily worked as a putty and is spread into the tray, which may be of wood or tin, and the surface leveled by pounding with a mallet or hammer, then by drawing a straightedge over it.
A sharp knife, a smooth board and a straightedge are all the tools needed, says Camera Craft.
Place the leather on some level, nonabsorbent surface and with the tool--and a straightedge on the straight lines--indent the leather as shown.
With the knife and straightedge trim off the surplus material at the top and bottom and the book is ready for use.
The cutter is guided along the straightedge as shown in Fig.
A surveyor in India once made an alidade out of a piece of straightedge and two sights made of native coins hammered out by a native blacksmith.
Then, if a ruler or straightedge be placed against these two needles and a fine line drawn connecting them, this line will show the exact direction of the object from Sta.
We then level the straightedge with a spirit-level, and mark a line on the third target, continuing the process until we have marked a straight and horizontally level line across all the targets, the operation being shown in Fig.
B B of larger diameter, and perform our marking upon it, carrying the marks across the smaller circle with a straightedge placed to intersect the centres of the circles and the points marked on each side of the diameter.
To test the alignment of the jaws at end F, press a straightedge against the outside face of the hub and measure the distance J, Fig.
The American Machinist, or the dead centre C and a straightedge may be used as follows.
The first requisite for this is a straightedge of iron or brass, as true as possible.
When this has been done, the very uneven stones must be ground with a coarse sandstone and plenty of water applied to the elevated places till the straightedge can be applied in all directions without showing any material interstices.
To make sure, thestraightedge can be applied again.
This ruler must be laid on the stone in various directions, and the lithographer must note all parts where there is space between the straightedge and the stone.
It is necessary also that the straightedge be applied frequently.
To get the correct slant on the bottoms of these posts, lay a straightedgeso that its edge touches the bottom of the front post at its front surface, but keep it 1 in.
In other words, the trisection of any angle, by the use of the straightedge and compasses alone, is impossible.
The straightedge and the compasses are the only two drawing instruments recognized in elementary geometry.
There is, however, a much more worthy interest than the mere mensuration of the circle, namely, the construction of such polygons as can readily be formed by the use of compasses and straightedge alone.
Since we can construct [sqrt]a by means of the straightedge and compasses, it would be possible for us to square the circle if we could express [pi] by a finite number of square roots.
This, like Postulate 1, requires the use of a straightedge for drawing the physical figure.
Plato had laid the foundations for the science, in the form of axioms, postulates, and definitions, and he had limited the instruments to the straightedge and the compasses.
It may be given as a case of practical drawing even before the problems are reached, particularly if some preliminary work with the compasses andstraightedge has been given.
Hence a geometric construction cannot be effected by the straightedge and compasses unless it is equivalent to a series of rational operations or to the extracting of a finite number of square roots.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "straightedge" in a variety of sentences. We hope that you will now be able to make sentences using this word.
