TUB 



TUB 



TuTi-Fijh, ill Ichthyology, an Englilli name given lo a 

 ipecies of trigla, fometimes called the Jlying-jijh. Sec 

 Trigla. 



Tv^-Man, m xhe Court of Exchequer. See Precedence. 

 TUBA, in Antiquity. See Trumpet and Lituus. 

 Tuba, in Natural Hijlory, a name by which many old 

 authors call the buccinum. 



Tuba, in Geography, a river of Ruflia, which runs into 

 the Enifei, 16 miles S.W. of Abakanilv, in the government 

 of Kolivan. 



TUBAI, one of the fmall Society Iflands, in the South 

 Pacific ocean ; about 12 miles from Bolabola. S. lat. 16^ 

 12'. W. long. 151° 44'. 



TUBANSKA, a town of RufTia, in the government of 

 Irkutflc ; 44 miles N.W. of Ilimfiw 



TUBANTES, in Ancient Geography, a people of Lower 

 Germany, on the other fide of the Rhine. According to 

 Cluvier, they at firil inhabited the country now called the 

 counties of Ruven(berg and Lippe ; and from hence they 

 traverfed the territory which lies between the Rhine and 

 tlie Sala. 



TUBAON, in Geography, a town on the north coaft of 

 the ifland of Java. S. lat. 5° 50'. E. long- 1 1 2° 14'. 



TUBBAULEH, a town of Hindooftan, in Lahore; 

 to miles S.S.W. of Callanore. 



TUBBER, in Mining, a name given in Cornwall to that 

 mining inftrument, which is in other parts of Er:gland called 

 a beek. 



TuBBER-Tlf/'n, in Cornivall, the people wlio work with 

 this tool, and who are, from its other name of beele, called 

 in other places bed-men. 



TUBBERMORE, in Geography, a poft-town of the 

 county of Londonderry, Ireland, which is <jo\ miles N. 

 by W. from Dublin. 



TUBE, Tubus, pipe, conduit, or canal ; a cylinder, 

 hollow withinfide, either of lead, iron, wood, glafs, or 

 other matter, for the air, or fome other fluid, to have a free 

 pafTage or conveyance through. 



The term is chiefly applied to thofe ufed in phyfics, 

 aftronomy, anatomy, &c. On other ordinai-y occafions, 

 we more ufually fay pipe. 



In the Memoirs of the French Academy of Sciences, 

 M. Varignon gives a treatife on the proportions neceffary 

 for the diameters of tubes, to give precifely any determinate 

 quantities of water. The refult of his piece turns upon 

 thefe two analogies ; that the diminutions of the velocity of 

 water, occafioned by its friftion againft the fides of tubes, 

 are as the diameters ; the tubes being fuppofed equally 

 long : and the quantities of water iffuing out of the tubes, 

 are as the fquare roots of their diameters, dedufting out of 

 them the quantity each is diminiflied. 



For the tubes of barometers and thermometers, fee Ba- 

 rometer and Thermometer. For the afcent of liquors 

 in capillary tubes, fee Ascent and Capillary. 



Tube, in AJlronomy, is fometimes ufed for tele/cope (which 

 fee); but more properly for th^t part of it into which 

 the leiifes are fitted, and by which they are direfted and 

 ufed. 



The goodnefs of the tube being of great importance to 

 that of the telefcope, we (hall here add its ftrufture. 



The Conjlruaion of a Draw-tube for a Telefcope The 



chief points to be regarded here are, that the tube be not 

 troublefome by its weight, nor liable to warp and difturb 

 the pofition of the glafles ; fo that any kind of tube will not 

 ferve in every cafe : but, 



I. If the tube be fmall, it is beft made of thin brafs 



j)laLes covered with tin, and formed into pipes or draws, to 

 Hide witliin one another. 



2. For long tubes, brafs or iron would be too heavy ; for 

 which reafon, fome chufe to make them of paper, thus : a 

 wooden cylinder is turned, of the length of tiie paper to be 

 ufed ; and of a diameter equal to that of the fmalleft draw. 

 About this cylinder is rolled and pafted paper, till it be of 

 a fufRcient thicknefs : when one tube is dry, provide others 

 after the fame manner ; ftill making the lall ferve for a 

 mould for the next, till you have enough for the length of 

 the tube defired. Lallly, to the extremes of the draws ai'e 

 to be glued wooden ferrils, tlfat they may be drawn forth 

 the better. 



3. Since paper draws are apt to fwell with moift weather, 

 fo as to fpoil their Hiding ; and in dry weather to flirink, 

 which renders them loofe and tottering ; in both which 

 cafes, the fituation of the lenfes is eafily difturbed ; tlie 

 beft method of making tubes is as follows : glue parchment 

 round a wooden cylinder, and let the parchment be coloured 

 black, to prevent the reflefted rays making any confufion. 

 Provide very thin flits of beech, and bending them into a 

 cylinder, glue them carefully to the parchment ; cover this 

 wooden cafe with white parchment, and about its outer ex- 

 treme make a little ring or ferril : after the fame manner 

 make another draw over the former ; and then another, till 

 you have enough for the length of the tube. 



To the inner extremes of each draw, fit a wooden ferril, 

 that the fpurious rays, ftriking againft the fides, may be in- 

 tercepted and loft. In thofe places where the lenfes are to 

 be put, it will be proper to furnifh the ferrils with female 

 fcrews. Provide a wooden cover to defend the objeft-glafs 

 from the duft, and putting the eye-glafs in its \vooden ferril, 

 faften it by the fcrew to the tube. Laftly, provide a little 

 wooden tube of a length equal to the diftance the eye-glafs 

 is to be from the eye, and fit it to the other extreme of the 

 tube. 



Tube, or Pipe, among Flor'fls, is that part of a fine 

 flower which has fomething of a ftraw-like pipe or open- 

 ing ; and which, to conftitute a good flower, in fome 

 forts, as thofe of the auricula and polyanthus, fliould Hand 

 exaftly in the centre of the bloffom, and have a truly 

 round or circular form ; be well filled with chives or little 

 thread-hke parts, fomething in the manner of a brufh at 

 their points, rifing even with the face of the pip or blolfom ; 

 as when only the fl;yle or pointal rifes like a pin, without 

 beino- furrounded or encompaffed with the chives to the 

 fame height, the flower is faid to be pinned, and difplays 

 a chafm or vacancy, which is fo very unpleafant to the eye 

 of the curious in flowers, that though, in many other re- 

 fpefts, fuch flowers may have good properties, yet failing 

 in this central perfection and beauty, nothing clfe can 

 atone or make up for it ; and fuch flowers arc, of courfe, 

 held in but fmall eftimation by the florift. See Thrum 

 and Truss. 



Tubes, in Artillery, are inftn-ments ufed in quick firing, 

 made with us of tin ; their diameter is two-tenths of an inch, 

 fo as jufl; to enter into the vent of the piece ; their length is 

 about five or fix inches, with a cap above, and cut (laming 

 below in the form of a pen, and the point is ftrengthencd 

 with fome folder, that it may pierce the cartridge. 



Through each tube is drawn a quick-match, and tiie cap 

 is furniflied with mealed powder, moiftened with fpirits of 

 wine. To prevent the mealed powder from falling out by 

 carriage, a cap of paper is tied over it, which is taken olf 

 when ufed ; but of late this cap is made of flannel, fteeped 

 in fpirits of wine, and with faltpetre diffolved in it ; and 

 6 there 



