ven, shows the applicability of the method, while The weight, w, acts on the long lever, Z, and the resistance, some of the details mentioncd may help to explain the use R,on the short lever,?. Then of the apparatus. wL R: w=L: J, and R=7- Weight taken. Per cent found. That is to ray, the force of… … should, of course, be laid on an inclined table capable of ad- out in per‘ection; the machine withal being excessively com- justment to the hight of the microscope employed, the top pact and well arranged. veing also made movable to suit ihe angle at which the mi- The pile of envelope blanks being…
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