In most insects that feed by suction the mandibles are modified.
The 'disposition of these valves divides this type of pump into suction pumps and force pumps.
Thus if the instrument depends on the pressure or suction effect alone, and this pressure or suction is measured against the air pressure in an ordinary room, in which the doors and windows are carefully closed and a newspaper is then burnt up the chimney, an effect may be produced equal to a wind of io m.
The other structural characters of the Order may be briefly summarized as: - mouth-parts adapted for piercing and sucking, or for suction alone, and consisting of a proboscis formed of the labium, and enclosing modifications of the other usual parts of the mouth, some of which, however, may be wanting; a thorax fused into a single mass; and legs with five-jointed tarsi.
Larva campodeiform, usually feeding by suction (exceptionally hypermetamorphic with subsequent eruciform instars).
As if Matthew thought the encouragement was intended for him, he latched onto her breast, creating a suction that sent tiny bubbles down the feeding tube.
While inflating the bellows he would leave the suction port open and close the discharge port with a pinch of his finger; and while blowing the air against the fire he would leave the discharge port open and pinch together the sides of the suction port.
This dilatation may be increased by local warmth, and poultices or fomentations are commonly applied to inflamed parts; recently suction apparatus has been used for the same purpose or ligature so as to cause venous stasis (Bier's treatment).
Where the" natural draught "is not sufficient, it is aided either by blowing air under the grate or else by suction at the other end.
The action is essentially that -of the common suction pump. The construction was subsequently improved by many experimenters, notably by Boyle, Hawksbee, Smeaton and others; and more recently two pump barrels were employed, so obtaining the same degree of exhaustion much more rapidly.
We have hitherto supposed the pumps for drawing the water to have been placed in the well at such a level as to be accessible, while the suction pipe only is below water.
These insects are able, therefore, to bite as well as to suck, whereas most insects which have acquired the power of suction have lost that of biting.
This consists of passing a sail, attached to cords, and charged with oakum, wool, and other materials, under the vessel's keel, in such a manner that the suction of the leak may draw the canvas into the aperture, and thus partially stop the vent.
It ascends the flow pipe by convection, where its onward journey would speedily end if it were not for the driving force of other molecules of water following, and the suction set up by the gravitation into the boiler of the cooled water by the return pipe.
To prevent this he might make a second or suction hole, and thus he would have a veritable engine, perhaps one of the very earliest of all.
Suction gas is being tried in some offices as a supplanter of electricity and is said to be much cheaper as a power producer.
High; JJ, the horizontal iron tube; K, the descending branch mentioned above, for producing a certain amount of suction by means of the gas-siphon thus formed.
Fleuss consists of a vacuum pump capable of reducing the air pressure to a fraction of a millimetre, the suction pipe of which is connected first with a vessel containing sulphuric acid, and second with the vessel containing the water to be frozen.
The refrigerator, which, Refrigerator Condenser T, Compressor consists of a coil or series of coils, is connected to the suction side of the pump, and the delivery from the pump is connected to the condenser, which is generally of somewhat similar construction to the refrigerator.
One end (generally the bottom) of the coils is connected to the liquid pipe from the condenser and the other end o to the suction of the compressor.
The air is distributed by means of wood air trunks with openings controlled by slides, and similar trunks are pro vided in connexion with the suction of the compresser to conduct the air back to the machine.
In such mines the mineral was carried out on the backs of men, and the water was laboriously raised by a long line of suction-pumps, operated by hand, each lifting the water a few feet only.
As the water level falls the tanks readily follow it while at work, whereas pumps must be lowered to new positions to keep within suction distance.
I shows the arrangement in a suction pump. A is the cylinder within which the piston B is moved up and down by the rod C. D is the inlet pipe (the lower extremity of which is placed beneath the surface of the liquid to be G removed), and G is the outlet pipe.
They feed entirely by suction, and the majority of the species pierce plant tissues and suck sap. The leaves of plants are for the most part the objects of attack, but many aphids and scale-insects pierce stems, and some go underground and feed on roots.
This time he created enough suction to pull her nipple well into his mouth - feeding tube and all.