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Updated: May 29, 2025
This curious arrangement has the effect of shortening the lever-arm of the ovipositor and bringing the starting-point of the filament nearer to the fulcrum, namely, the legs of the insect, and of thus assisting the difficult task of inoculation by making the most of the effort expended. To sum up, the ovipositor when at rest goes round the abdomen.
This does not seem strange when we reflect that every minute filament, the grain, the knots, spots, dents, and finger-marks are all reproduced. Anecdotes of his superhuman patience are recounted which are scarcely credible. It is said he was five days in copying the hand of a Madam Spirings whose portrait he painted. Who knows how long he was painting her head?
Connect a wire to the ground wire between the bank-wound inductance coil and the ground proper, i.e., the radiator or water pipe, connect the other end of this to the + electrode of the A battery and connect this end also to one of the terminals of the filament.
We are used to force in the muscles of horses, in the expansive potency of steam, but here we have force stripped stark naked, nothing but a filament to cover its nudity, and yet showing its might in efforts that would task the working-beam of a ponderous steam-engine. I am thankful that in an age of cynicism I have not lost my reverence.
You can, however, get very good results without any special charging arrangement by simply connecting one post of the rheostat with the negative terminal of the filament and connecting the low potential end of the secondary of the tuning coil with the or negative electrode of the A battery. This scheme will give the grids a negative bias of about 1 volt.
The units of the recesses each consist of a living particle, whose free extremity is raised into a kind of collar, from which projects a lash-like filament known as a flagellum. This lash is in constant movement.
When the powder is used I have found it best to proceed as follows: I make a thick paint of carborundum and tar, and pass a lamp filament through the paint. Taking then most of the paint off by rubbing the filament against a piece of chamois leather, I hold it over a hot plate until the tar evaporates and the coating becomes firm.
Three Electrode Vacuum Tube Detector. In this more recent type of vacuum tube the third electrode, or grid, as it is called, is placed between the wire filament and the metal plate and this allows the current to be increased or decreased at will to a very considerable extent.
The young leaves when first formed stand upright, but soon become inclined; at this period they terminate in a stalk or filament, with the pitcher at the extremity hardly at all developed. The leaves now exhibited slight spontaneous movements; and when the terminal filaments came into contact with a stick, they slowly bent round and firmly seized it.
Here the filament passes through the insect from end to end and emerges underneath. Its issue is therefore near the base of the abdomen, instead of at the tip, as usual.
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