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<p>[QUOTE=&quot;kentworld, post: 26683, member: 35&quot;]Googling Ralph Gerbrands Co images, I came up with these 2 for cumulative recorders:</p><p><a href="http://aubreydaniels.com/institute/node/136" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://aubreydaniels.com/institute/node/136" rel="nofollow">http://aubreydaniels.com/institute/node/136</a></p><p><a href="http://aubreydaniels.com/institute/node/132" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://aubreydaniels.com/institute/node/132" rel="nofollow">http://aubreydaniels.com/institute/node/132</a></p><p><br /></p><p>From Wiki page on BF Skinner:&nbsp; </p><p><font size="4"><b>Cumulative recorder</b></font></p><p>The cumulative recorder is an instrument used to automatically record behavior graphically. Its graphing mechanism consisted of a rotating drum of paper equipped with a marking needle. The needle would start at the bottom of the page and the drum would turn the roll of paper horizontally. This cumulative recorder was used for the Skinner box to record the rat&#039;s behavior.<a href="http://en.wikipedia.org/wiki/B._F._Skinner#cite_note-Thorne.2C_B._M._2001-40" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/B._F._Skinner#cite_note-Thorne.2C_B._M._2001-40" rel="nofollow">[40]</a> This apparatus produced consistent and accurate records of behavior.<a href="http://en.wikipedia.org/wiki/B._F._Skinner#cite_note-Thorne.2C_B._M._2001-40" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/B._F._Skinner#cite_note-Thorne.2C_B._M._2001-40" rel="nofollow">[40]</a>[/QUOTE]</p><p><br /></p>

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