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Show Well, WW Do you Know 2 i fun , games and knowledge v oy MARTHA GLAUBER SHAPP, Editor. The New Book of Knowedge Do you know how barometers work ? The barometer is an instrument instru-ment that measures air pressure. pres-sure. There are several kinds of barometers, but the kind seen most often is the aneroid barometer. ("Aneroid" means "without liquid.") Inside the barometer is a small chamber with thin metal walls. Most of the air has been drawn out wasaime flra MERCURY ajftinSafc BAROMETER of this chamber. The thin walls move in or out slightly when there is an increase or decrease in the air pressure outside. A pointer on the front of the barometer is connected by a lever to the chamber walls. The pointer shows these small changes on a dial marked off in units of air pressure. There are other kinds of barometers, however, that do use liquids. The very first barometers were of this type. An Italian scientist invented the mercury barometer in 1643. He took a long glass tube that was closed at one end and filled it with mercury. He turned the tube upside down in a pan that contained more mercury. The mercury in the tube started running out, but soon it stopped. The weight of the mercury in the tube was balanced by the air pressure on the mercury outside. out-side. When air pressure increased, in-creased, the mercury column went up. When air pressure decreased, the column went down. Because mercury barometers barom-eters are very accurate they are still used today, mainly in scientific laboratories. What is the difference between an invention and a discovery? It is often hard to tell the difference between an invention inven-tion and a discovery, but we usually speak of inventing something that did not exist before and of discovering something that did exist before be-fore but was not known. Thus we say that Galileo discovered discov-ered the spots on the face of the sun. (Sunspots had always al-ways existed but no one knew about them before Galileo.) We say that Thomas Edison invented the phonograph, since there was no such thing until Edison created one. (For .i free booklet. "The Magic Carpel, " illustrated in color from The New Book of Knowledge, send name and address to Martha Glauber Shapp. Box 47. Putnam Valley, New York 10S79. Save 12 on the most needed Vitamins for your famijy rANDV I IKE (very high potency) SPECIAL (maintenance PHOS-CAL CANDY-LIKE VITAMIN C VITAMIN a TABLETS FOR VITAMINS & F0RMULA Plus M'NERAIS' .with v,tm,n D1 VITAMIN C TABLETS "L CHILDREN MINERALS Te ve 6es, f;s"ulanct AaielJ Dec,us.chtit jgy 5KS D, usChe.,ble ".comment (0, v,l,nn',nd iron supplement orang.-Mawed table,, """'129 ?0'" """ ?, T ?,,, achve aflulls and tome ,n capsules and adults. supplying talcum. ,.,., BOW Z lor i. rfj Iruit flavors senior ntnens lor adults phosphorus and 100 mg 100 s 250 mf. 00 s ? o ? 50 ,n multi-colon. swior aniens, v.lam.n D. Reg $1 29 Reg $2 49 each IOOsReg S2 59 250 Tablets 160 Capsules 180 Capsules 225 Capsules Now 86c Now2forl2.49 Now '1.73 P.egS7A9 Reg 512 98 " 58 . ""'.V - r 250 Capsule, 250 mg 100's 500 mg 50's 50 000 USP unit. M 3& Now Vi price Now Vi price Now 'j price Now V3 price ,n s2 9g Reg 11 98 Reg J2 49 each 100 s Reg S4 98 $3.75 '6.49 s4-80 s3.49 Now1.99 Now1.32 Now2lor2.49 Now3.32 OTHER McKESSON VITAMIN VALUES! Vitamin B-1 Tabs. 50 mg.-100's . . . reg. $2.50 now 2 bottles for $2.50 MKMMMH--MiiiHi-i--i'M: (Thiamine HCI) T Vitamin B-1 Tabs. 100 mg.-100's . . . reg. $4.25 now 2 bottles for $4.25 (Thiamine HCI) P" Q I" H I , ' Vitamin B 8 Tabs. 25 mg.-100's. .. reg. $4,19 now $2.79 I" ittL! A e, ' (Pyridoxine HCI) S . Z' Vitamin B-6 Tabs. 50 mg.-100's. .. reg. $6.69 now $4.46 niiTrn rnnnr -V domeHCi OUTER SPACE s A I Vitamin B-1 2 Tabs 25 mcg.-100's... reg. $3.29 now $2.19 2T - Vitamin B-12 Tabs. 50 mcg.-100's ... reg. $5.29 now $3.53 QPHfifli ROOK o-dk I Vitamin B-12 Tabs 100 mcg.-100's... reg. $9.49 now $6.33 OUnUUL DUUH fMffi Here's the sale you've been waiting for! Famous nationally advertised COVERS jHIZe ' full strength Bexel Vitamins for the entire family at big big savings. 'sHHCf- I During this "0ut-of-this-wor!d" sale many of these Bexel Vitamins are 3EB5sS I offered at half-off their regular prices. ..and there are big price reduc- Snows distances to planets and data Ussss I tions on all the rest. This is the time to stock up on your Bexel vita- on space flights. While they last- mm supply while this sale is on. When you come in ask for the FREE limited supply. A SCHOOL BOOK COVERS with the coupon below. ..and bring in the com- iVi I Wi 1 1 kIK'1'1 -'1 si w pleted coupon for your chance to win the valuable Astronomical Tele- mtatttmmttmm scope. No purchase required. THESE AMAZING VITAMIN VALUES ARE AVAILABLE NOW AT: Emergency and after hours phone 489-6306 SS REX DRUG 238 South Main "We Deliver" Phone 489-5636 Fertilize this year before plowing In order that your soils can be regenerated by soil micro-organisms and by freezing and thawing apply fertilizer before plowing this fall. This step takes the hazard out of being forced into wet fields next spring and gets you started toward top yields. Your USS fertilizer dealer will help you plan a fall fertilization fogram. He-M make sure yQu ggt order when and where you want it. When you visit him, be sure to ask for the latest USS technical bulletins on fall fertilization and seed bed preparation. And remember to order your fertilizer for fall plowing! (USS) Fertilizers |