Gilley, Frank M · Boston, Allyn & Bacon · leaf 288
cknesses of card under thebottom, till B and C are wet,but not covered by the water.Look into the jar on a levelwith the water. When prop-erly adjusted, the water justslants up on each side ofthe pin, without covering thetop, as in Fig. 250, whei-ethe pin B is shown touchingthe surface of the… … Fig. 249. w If this pin does notcover the image of A, move the head un-W til it does. Put another pin, E, exactlyin line with D and the image of A.Remove the board, wipe off the water,and hammer in the pins tightly; see that they are straight. Lay a ^-3-tO^ Fig. 250. 278 PBINCIPLES OF PHYSICS.
Physics
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