| OCR Text |
Show FACTS ABOUT THE RAINFALL. Ilnur It,.. O.n.iil il v of llain 1., .Mimuv.I. When ml IVIi, it I- K. iivi-,1. I 1 f ii.meous vapor, the inrtivi.lv.il vap.,r vesi clcs become larger and li.-aN icr. and u linallv individual vesicle ifiiitc, tii.-v ,S' reiruliir drop which fall as i.iln.- At siwi begins raindrops arc v,t small, 1 .11 1- t li v increase as they fall. fr hum their low temperature they condense On tlicii' surface sur-face the aqueous vapor of the layers of ait through which thev fall. The q.iantii v 0; rain which falls annually in any ni.-.n place, or the annual ra.niall, is measured by means of a tain gauze or pl,i iom :-ter. Tlie simplest form of rain gauge consi u of a funnel which has a definite area, twelve square inches f.,r example, and Rhich fits in 4 bottle. The rain whi..li THE SIMPLEST FORM OF I.4LN GA ta'ilC. falls on this area is colrecte.l in the bottle,, and the quantity which has fallen during the period of observation is measured by ! uieans of a graduated glass: Thus if in twenty-four hours the quantity collected j measures 2.3 fluid oiinees.ohis iseqnal to j four cubic inches, and if. the area of the j funnel is twelve inches. I his represents a ! rainfall of one-third of an nch in twenty ! four hours. The funnel and bottle aie usually inclosed in a metal cylinder which ' is taller than the funnel, so as to retfiin ! mi v snow which may all, j .Many local circumstances may affect the ; quantity of rain which fails in different ! countries; but, other things- being equal, most rain falls in hot climates, for t here ; the vaKrizal ion is most, abundant. The! rainfall decreases, in fact, from the equator to the poles. Thequantity Varies with the II 4 1 in spring. CO; in summer, 0..1, and in i autumn, 4.8 inches. The -heaviest annual! rainfall at anyplace on the' globe is on the j Khasi hills, iu Hernial. here it is tsw inches, of which SOU inches fail in seven months. Cuder similar circumstances the quantity quan-tity of rain diminishes with the distance from the sea. Thus, if the animal rainfall is 1 in the center of Cernianv, it i.s1.- in the ! eenlerof Kngland and 1.7a on lhe Knulish j coast. An inch of rain on a Square yard ,t' ! surface represents a fall ot 4..U ponn!,4.r-j 4.77 gallons. , , j 7 An InterfstiiiK l'l.e,i..n.. n,.i. -t'ti-vtiii-i'i 'g nliptm-ti uifctuvirluo of i winch white objects, or rT.ose. ol a VeTTT bright colorappear larger than they really I lk" Ilia white square upon a black ground seems larger'than an exactly equal black square upon a white ground isee cul). Willi a r lUZlg' 'j; raseAgain, ''a F ? II platinum wire f j j made red hot by f-3 hut - : the passage of an tj . j electrical current Stjwwj" seems far thicker t' I tha" " is in real & ity. -Irradiation is f-- I 1 held to arise from ? 1 the fact, that tlie . 1 impression pro- j duced on the re bs,l",lWfeffWlJ (ina extends bt ; ; ' yond the outline EFFECT OF IRRADIATION -0f t,e jnlage Jt bears the same relation to the space occupied occu-pied by the image that the duration of the impression does to the time during which the image is seen. The effect of irradiation is very percepti ble in the apparent magnitude of stars, which may thus appear much larger than they really are; also in tbo appearance of the moon when two or tliree days old, the brightly illuminated crescent seeming to extend lieyond the darkir portion of the disk and to hold it in its grasp. Plateau, who investigated this subject, found that irradiation differs very much in different people and even in the same nelson nel-son it differs on different days. He also found that irradiation insreases with the luster of the object and the length of time duriiur which it is- viewnl. It manifests itself at all distances, diverging lenses; increase in-crease it, condensing leasts diminish it. Lake Statlsfcs. The Marine Record is authority for thu compilation. These figure show the mean level of the lake surface1 above the mean tide at New York, and their maximum depths, respectively: ate-Ontario, S4o.81 feet, 733 feet deep; Lake Erie, ST-2.S6 feet and SiO feet deep; Lake Michigan, 581 feet, 870 feet deep; Lake Juron, 581. 2a feet, 730 feet deep;-l.ake Superior, 601.75 feet, 1,003 feet deep. The deipest water runs very fairly in midlake Ithroughout the chain. The areas of tater surface in square miles according tf Crossmar.'s da lineation i3 as follows: Like Superior, 31,-200; 31,-200; Lake Huron, 23,800; Lake Michigan, W.4S0; Lake Erie, 9.SW0; I.e Ontario, T.S40, or a total area of SH.ooO sol ire miles. Won, I Pulp BpriiiEa. . Beat ings constructed Decompressed woul pulp are the outcome oi some ingenious mechanic's. brain. Inyeiion says: "Com biccd with graphite thy require no iu bric-iticn, nod greatly reduce the friction. fric-tion. The compound ca be cut or driiled like m?t-al, and is almo-f.s hard. A dynamo dyna-mo is stated to have heel fitted . with t'ce?e bearings with satisfactcjy result?. News anil jutes, A new hydraulic she;is recently started, up at a steel plant in Eisland is described by The Industrial World,as being power tul enough lo cut thnuch an ingot so inches wide by lij inchj thick with ap parent ly no eft on at ail, h.t the time taken lor the operation doesbot exceed three minutes. I It has been uoted tl t in some of the Maine streams fish will p, tor the purpose of laying their eggs, int water so shalloty that the fins on their baf; are out of the water. An electrical journal Hs of the completion comple-tion of a new spring r.otor, which the maker claims will comply revoiationize rapid transit and put ci:Kty wrong tee ' back n'ambaf. 1. ... ... |
