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![A text book of physics, for the use of students of science and engineering . d a pure zinc rod the negativeelectrode. Upon the mercury (Fig. 850) rests a layer of A text book of physics, for the use of students of science and engineering . d a pure zinc rod the negativeelectrode. Upon the mercury (Fig. 850) rests a layer of](https://c8.alamy.com/comp/2CE18PC/a-text-book-of-physics-for-the-use-of-students-of-science-and-engineering-d-a-pure-zinc-rod-the-negativeelectrode-upon-the-mercury-fig-850-rests-a-layer-of-paste-madeof-mercurous-sulphate-and-a-saturated-solution-of-zinc-sulphateupon-this-rests-a-saturated-solution-of-zinc-sulphate-into-whichdips-the-zinc-electrode-in-order-to-make-sure-that-the-solutionis-saturated-some-crystals-of-zinc-sulphate-are-placed-upon-the-topof-the-paste-contact-is-made-with-the-mercury-by-means-of-aplatinum-wire-sealed-into-a-glass-tube-so-that-the-tip-of-the-wireprojects-into-the-mercury-the-glass-2CE18PC.jpg)
A text book of physics, for the use of students of science and engineering . d a pure zinc rod the negativeelectrode. Upon the mercury (Fig. 850) rests a layer of
![The Ontario high school physics. CONVECTION CURRENTS 279 316. Convection Currents. The water in the test-tube(§ 312) remains cold at the bottom when heated at tlie top. Ifthe heat is applied The Ontario high school physics. CONVECTION CURRENTS 279 316. Convection Currents. The water in the test-tube(§ 312) remains cold at the bottom when heated at tlie top. Ifthe heat is applied](https://c8.alamy.com/comp/2CEGK73/the-ontario-high-school-physics-convection-currents-279-316-convection-currents-the-water-in-the-test-tube-312-remains-cold-at-the-bottom-when-heated-at-tlie-top-ifthe-heat-is-applied-at-the-bottom-the-mass-of-water-is-quicklywarmed-the-explanation-is-that-in-the-latter-case-the-heatis-distributed-by-currents-set-up-within-the-fluid-the-presence-of-these-currents-is-readily-seen-if-a-fewcrystals-of-potassium-permanganate-are-dropped-into-a-beakerof-water-and-the-tip-of-agas-flame-allowed-to-comein-contact-with-the-bottomeither-at-one-side-as-in-fig307-or-at-the-ceiitre-as-infig-3-2CEGK73.jpg)