HYDROTECHNICAL GATE, see in an item. A gate.

HYDROTECHNICAL TUNNEL, the culvert of a selfcontained lateral section. Distinguish hydrotechnical tunnels: water-overflow, power, shipping, irrigational, etc.

GIDROTIPIJA (from gidro... And grech. typos - an impress), a way of obtaining of colour positives with application of water soluble colors. Implements a successive carry of three colored plotting from gelatinous reliefs (templates) on photographic paper or a cine film.

HYDRAULIC TORQUE CONVERTER (from gidro... And the transformer), a hydrodynamic transmission; as against a hydraulic clutch in a hydraulic torque converter the circulating liquid follow-up passes through the reactor (stator) which veers a torrent and allows besstupenchato to adjust a twisting moment and a rotary speed of the conducted (turbine) bank. Apply in transmissions of automobiles, gasoline locomotives, etc.

HYDROTROPISM, see. Tropisms.

The WATER-WHEEL, the same, that the hydraulic turbine.

HYDRAULIC PERCUSSIVE BORING, percussion-rotary drilling with use of a submersible hydraulic submersible impact tool. It is applied in rocky breeds.

HYDRAULIC PROJECT, group of hydrotechnical constructions, consolidated on an arrangement and conditions of their team work. Are sectioned on power, vodno-transport, water-intaking, etc. There are complex, simultaneously executing some aquicultural functions More often.

GIDROFILIJA (from gidro... And... filija), an allogamy of some water plants (napr., a hornwort) with the help of water.

HYDROPHILY, ability of substance (material) to be watered. To hydrophilous substances concern, napr., clay, silikates. Hydrophily - a particular case of lyophilic property.

HYDROPHYTES (from gidro... And grech. phyton - a plant), the plants submersed in water only by heels (as against hydathophytes) and attached to a ground, napr. A reed, rice, etc.

HYDROPHOBY (from gidro... And grech. phobos - pavor, phobia), disability of substance (material) to be watered. To hydrophobic substances concern, napr., many metals, fats, waxes, silicone fluids. Hydrophoby - a particular case of lyophobic property.

The HYDROPHOBIC COATINGS, not watered covers on the basis of hydrophobic substances. Are put on a surface of metals (for a corrosion prevention in the wet atmosphere), tissues, a leather, wood and other materials (for waterproofing and nepromokaemosti).

HYDROPHOBIC CEMENT, receive pulverizing of a cement clinker with gypsum and gidrofobizirujushchej the additive (a naphthenate soap, asidol, etc.) which reduces a hygroscopicity of hydrophobic cement and drop of his activity prevents at a prolonged storage.

HYDROPHONE (from gidro... And... A background), the receiver of a note for an aqueous medium. The basis of a hydrophone - an electroacoustic transducer, more often piezoelectric type.

HYDROFORMYLATION (oxo synthesis), apposition of white damp and hydrogen to olefines at the presence of the catalyst with education of aldehydes, napr., CH3CH = CH2 + CO + H2? CH3CH2CH2CHO. Apply in an industry at obtaining spirits and acids (accordingly restoration and oxidation of aldehydes), napr., butanol from propylene.

HYDROCHEMISTRY, the science investigator chemical composition of natural waters and regularity of his change under influence physical, chemical and biological impacts. The hydrochemistry is closely related with a geochemistry and hydrogeology.

HYDROQUINONE (fallow - digidroksibenzol), C6H4 (OH) 2, light grey crystals, tïë 174 °C. An intermediate product in manufacture of the dyes, showing substance in photos, antioxidant, polymerization retarder.

HYDROPHORIA (from gidro... And grech. choreo - I advance), distribution of seeds and fruits of plants water flows (a sedge, an arrowhead, a water plantain, a coconut palm).

GIDROTSELE (from gidro... And grech. kele - a swelling), a clump of a liquid in environments of an ovule at aboriginal inflammatory processes, at a general dropsy or inborn.