. Inductive elementary physical science with inexpensive apparatus, and without laboratory equipment . onvenient both to obtain and to use. No. 10, price 45 cents, is a trifle too large, and No. 9is not large enough, for a l:[-inch hole, but just right forsizes between 1^ and \% inches. From 1| to Its, No. 11,price 50 cents. From 1| to Ig, No. 12, price 55 12 is exactly li inches diameter at the smaller end,hence will not work well for all experiments in a 1^-inchmouth, but will for one atrifle more or less than 1^.These stoppers have holesthe same size, namely, \ inchdiameter; No. 9
. Inductive elementary physical science with inexpensive apparatus, and without laboratory equipment . onvenient both to obtain and to use. No. 10, price 45 cents, is a trifle too large, and No. 9is not large enough, for a l:[-inch hole, but just right forsizes between 1^ and \% inches. From 1| to Its, No. 11,price 50 cents. From 1| to Ig, No. 12, price 55 12 is exactly li inches diameter at the smaller end,hence will not work well for all experiments in a 1^-inchmouth, but will for one atrifle more or less than 1^.These stoppers have holesthe same size, namely, \ inchdiameter; No. 9 has smallerholes. Price of an excellentrubber tubing to fit ^-inchglass is 8 cents per foot; ofthe very best (the same weuse and furnish), 10 same size tvibing can bebought for 1 cents, being, ofcourse, a much inferior THE 100 IN 1 PHYSICALSCIENCE APPARATUS. In order to meet thewants of such as cannotmake all their apparatus, we ^»- ■ furnish sets at the lowest price consistent with tlie best material and of bottles with drilled holes, we have devised a. xviu TO THE TEACHER. glass cylinder, the Apparatus, which is much is shown in the cut, together with the largest num-ber of attachments used for any one experiment. Thiscylinder is made of clear pressed glass ; consequentlymouth and holes do not vary in size, the latter, for theeasier admittance of connectors, flare slightly. It is b\inches tall (more than 2\ times that of the cut), If inchesin diameter, with a thickness of \ inch at the top, whichincreases regularly to \ inch at the bottom. The thick-ness of the bottom (the only thing which can vary, andslight variation there does not affect its utility) is from \to I of an inch. It is not easily broken, usually sustain-ing a fall from table to floor unharmed, though not al-ways, depending probably upon the way it happens tostrike. ADDITIONAL APPLIANCES FOR EACH PUPIL OR SCHOOL. A few articles easily obtained, differing
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1897
