Bradley's kindergarten material and school aids. . Fig. 1. Fig. 2. Fig. 1 and 2 demonstrate mechanically that the area of a triangle is equalto its base, multiplied by one-half its altitude. Fig. 1 illustrates the prob-lems when a perpendicular from the apex falls within the base, and Fig. 2when it falls outside the base. Both triangles are formed of boards which are divided and hinged insuch a way that by simply swinging certain parts on their hinges the tri-angles become rectangles, twelve inches long and three inches high. Whenthe triangles and the sectors which form the circle are ordered
Bradley's kindergarten material and school aids. . Fig. 1. Fig. 2. Fig. 1 and 2 demonstrate mechanically that the area of a triangle is equalto its base, multiplied by one-half its altitude. Fig. 1 illustrates the prob-lems when a perpendicular from the apex falls within the base, and Fig. 2when it falls outside the base. Both triangles are formed of boards which are divided and hinged insuch a way that by simply swinging certain parts on their hinges the tri-angles become rectangles, twelve inches long and three inches high. Whenthe triangles and the sectors which form the circle are ordered at the sametime they will be packed together in a neat box. Price. Postage. The two triangles, § SO. 15 The two triangles and the circle sectors, . .25 CONTENTS OF CONE, SPHERE AND o 2 ;5. Fig. 1. Fig. 2. Fig. 3. These three pieces demonstrate the relation between the contents of acone, sphere and cylinder. Fig. 1 is a conical cup, three inches in diame-ter at the top, and three inches deep. Fig. 2 is a solid sphere. Fig. ;>is a cylindrical cup, three inches in diameter and three inches deep. Actual demonstration shows that the contents of the cone three timesfilled with water fills the cylinder, and that if the cylin<ler is tilled withwater and the ball entirely immersed there Avill remain in the cylinder justwater enough to fill the cone. It follows therefore that the contents ofthe three are as the numbers 1—2—8. The pieces are packed together ina box. Price, per set, $ ; postage, $ 48 BRADLET8 SCHOOL AIDS. PRIMARY PRiCKED SEWING CARDS. aonaoDannD oaoaoDOaaa?aoDDDDDnaaDDnnDDCDDDDDDDDaaan?annoDDODD ODD cii]: :nnD ODDDDD z1[Z~]t^ 11^ <cazi^^x^ ? ??DQ CHMxi:nj:sjtxp [MMa^^Jg G^-gCt^y^^ m Under this head we sell cards 5x3 1-2 inches all pri
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcolor, bookyear1896
