Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlectureson00wall Year: 1903 APPENDIX 159 in a photographic carrier suspended by a thread from a wheel revolv- ing by clockwork, descends vertically. The deflections of the galvanometer spot are recorded laterally upon the line of the horizontal slit. An electric bell gives warning when the plate has completed its descent. If necessary, a chronograph, and a signal to mark the beginning and close of excitation, are easily added when required. Before. ^looo voLb. Fig. 6i.—Response of an oxydise

Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlectureson00wall Year: 1903 APPENDIX 159 in a photographic carrier suspended by a thread from a wheel revolv- ing by clockwork, descends vertically. The deflections of the galvanometer spot are recorded laterally upon the line of the horizontal slit. An electric bell gives warning when the plate has completed its descent. If necessary, a chronograph, and a signal to mark the beginning and close of excitation, are easily added when required. Before. ^looo voLb. Fig. 6i.—Response of an oxydise Stock Photo

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RYR69Y

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Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlectureson00wall Year: 1903 APPENDIX 159 in a photographic carrier suspended by a thread from a wheel revolv- ing by clockwork, descends vertically. The deflections of the galvanometer spot are recorded laterally upon the line of the horizontal slit. An electric bell gives warning when the plate has completed its descent. If necessary, a chronograph, and a signal to mark the beginning and close of excitation, are easily added when required. Before. ^looo voLb. Fig. 6i.—Response of an oxydised copper plate, illuminated for seven seconds at one minute intervals. A prolonged illumination was made in the middle of the series to see whether any sign of ex- penditure would be elicited. (The first deflection by ttjV's ^ol' turned into circuit exhibits signs of ordinary polarisation.)

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