the light You shall see what it will do when we apply pressure to it. Here then we have our ray of polar ized light and I will first of all show you that the glass it in the course of the light the screen still remains tween three little points—one point against two—so as to bring a strain upon the parts and you will see what a curious effect that has. [Upon the screen two white dots gradually appeared.] Ah! these points show the position of the strain in these parts the force of cohe sion is being exerled in a different 'degree to what. it is in the other -parts and hence it allows the light to rim through: How beautiful that is! how it Makes thought come throlgh some parts-and leaves it dark in others ;. and all because we Weaken the force 'of cohesion Mechanical powet of straining or whether we take other means we get the same result ; and indeed .1 will show you by another experiment that if we heat the glass ta one part it will alter its internal structure and produce a similar effect. Here is 'a piece of common glass and 'if! insert:this in the path of the polarized ray I believe it will do nothing. There is the common glass [introducing 'it]. No light Teases through ; the screen 'remains quite dark ; but ram going to warm this glass in the lamp and you know yourselves that when you ponr warin wafer upon 'glass you pet a Strain and labor in the drilling of holes in the fianches of pipes or in such other objects as they may be required for which purposes ratchet drilling braces are at present generally used but are objectionable from the time con Two standards support a round bar B which carries D and drill D' to which motion is imparted through the bench wheels E F by the fly-wheel G. The flanch of the pipe P to be drilled is firmly gripped and held in position by means of the clamps J J and steadying S S so that it may be moved backward and forward and nuts N N as shown in the drawing. The ma chine may be driven at different speeds as may be re quired by
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