Popular science monthly . Mirror FARMERS \vi\cs in the great south-west, where ranches are miles in-stead of acres in extent, have a novelmeans of signaling the men in the , bells and horns are used to an-nounce dinner, butwhere the distanceis too great thesemeans fail, and thefarmers wife re-sorts to a mirrorand the heliographmethod. On a tour ofinspection, writesa telephone man,I happened tostop at a farm-house for woman whocame to the doorsaid that she wouldcall her inquiringwhere he was shehanded me a pairof binoculars andpointed down thevalley. I lookeda
Popular science monthly . Mirror FARMERS \vi\cs in the great south-west, where ranches are miles in-stead of acres in extent, have a novelmeans of signaling the men in the , bells and horns are used to an-nounce dinner, butwhere the distanceis too great thesemeans fail, and thefarmers wife re-sorts to a mirrorand the heliographmethod. On a tour ofinspection, writesa telephone man,I happened tostop at a farm-house for woman whocame to the doorsaid that she wouldcall her inquiringwhere he was shehanded me a pairof binoculars andpointed down thevalley. I lookedand could see the big caterpillar pullingtwo headers. As it rounded the end ofthe cutting on its return trip the womanflashed a mirror into the eyes of thedri\er three times. As I watched I couldsee the machine come to a stop andpresently I saw him coming up the roadin his runabout car. He was working fivemiles away. The woman explaineil thatshe learned this heliograph method fromthe Indians. But suppose its cloudy? THEwai. Calling the men to dinner by signalingwith a mirror. But what if it rains? Why You Can See Two Sides of aThing at the Same Time IF you spin a quarter and watch it youwill see both .sides of the coin at thesame time. This is exi)lained by the factthat the senses of man retain impressionsa little time. It is, indeed, the explana-tion of motion-picUires. Your \-isionpersists and >our percejition of objects iscontinued after the object itself has dis-appeared. This allows you to see twoparts of a thing—even such ojipositcs asthe front and back—simultaneously. War will Diminish the Stature andVigor of the Human Race most striking end effect ofir is race deterioration, com-ments Dr. (Jeorge W. Crile, a member ofthe American Ambulance who servedduring the first stages of the conflictabroad (A Me-chanistic View ofWar and Peace,T h e M a c m i 11 a nCompany). The effect ofwar on the race isseen in the effectof emigration onNew England. Instature, in energy,and
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
