<div dir="ltr"><div>My understanding is that they are very different things. <br><br>A simple folded plate is one that can actually be unfolded (i.e. the plate is folded to the size of the textblock but only bound along one edge - you have to manually unfold the free edge to see what's inside). So, a single unnumbered folded plate with content on one side would be:<br><br></div>[1] folded leaf of plates<br><div><br>A "double leaf" cannot be unfolded (i.e. typically the fold is along the fore edge and the two edges opposite the fold have been bound, so that the folded leaf is essentially functioning as a single leaf of double thickness with its interior facing pages blank). The latter is common with East Asian bindings - the whole book is likely to consist of double leaves. Although double leaves are technically folded, I think they have traditionally not been described as such in area 5 because they function as single leaves - you turn them just like the leaves of a "regular" book and there is nothing to unfold. So, an unnumbered double leaf with content on one side would be:<br><br></div><div>[1] leaf<br></div><div><br>And both of the above are to be distinguished from a "double plate" (i.e. a single plate bound along its center fold, creating a "double spread" when you turn to it). Again, although the plate is technically folded, it is bound along the fold (or attached to a stub in the binding), so you can turn each side of the double plate as if it were its own separate plate and you don't actually have to unfold anything. I think it is somewhat analogous to describing a bifolium as two leaves
despite the fact that they are technically joined by a fold. So, an unnumbered double plate with content on one side would be:<br><br></div><div>[2] leaves of plates<br><br></div><div>In the DCRM(C) draft, we currently have definitions that distinguish between a double leaf and a double plate (or try to - suggestions for improvements are welcome as I think we're not 100% happy with them - pictures would make it all so much easier!):<br>
<p class=""><span class="">Double leaf</span>. A leaf of double
size with a fold at the fore edge or top edge of the resource. Typically, the
folded leaf is bound at the inner margin and functions as a single leaf of
double thickness. The exterior of the folded leaf may be drawn or printed on
one or both sides; the interior of the folded leaf is blank. <span class=""></span></p>
<p class=""><span class="">Double plate</span>. A plate of double
size with a vertical fold down its center, along which it has been bound. The
plate typically features a large single map or other illustration that extends
across facing pages when the volume is opened. </p><p class="">Apologies if I've misunderstood anything!<br></p><p class="">Manon</p><p class="">--<br></p><p class="">Manon Théroux<br>Head of Technical Services<br>U.S. Senate Library<br>Washington, DC 20510<br>(202) 224-3833<br></p><p class=""><span class=""></span></p>
<br></div><div><br><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jun 28, 2015 at 2:53 PM, Deborah J. Leslie <span dir="ltr"><<a href="mailto:DJLeslie@folger.edu" target="_blank">DJLeslie@folger.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal">Is there any useful reason to maintain separate treatment of folded leaves of plates vs. double leaves?
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">DCRM(B)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">5B9.3. Leaves or pages of plates<u></u><u></u></p>
<p class="MsoNormal"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0982"></a>Record folded
<span>leaves</span> as <span>leaves</span> or pages of
<a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbPlateSLASHglossary&hash=PlateSLASHglossary&fq=myresources%7Ctrue" title="PlateSLASHglossary" target="_blank">
plates</a>. Make a note to indicate any folded <a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbLetterpressSLASHglossary&hash=LetterpressSLASHglossary&fq=myresources%7Ctrue" title="LetterpressSLASHglossary" target="_blank">
letterpress</a> <span>leaves</span>, <a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbIfSPACEconsideredSPACEimportant&hash=IfSPACEconsideredSPACEimportant&fq=myresources%7Ctrue" title="IfSPACEconsideredSPACEimportant" target="_blank">
if considered important</a>. <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0983"></a>50, [2] p., [2] folded
<span>leaves</span> of plates <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><span><a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbOptionalSPACEnote&hash=OptionalSPACEnote&fq=myresources%7Ctrue" title="OptionalSPACEnote" target="_blank">Optional
note</a><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0984"></a>:</span> The folded
<span>leaves</span> are <a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbLetterpressSLASHglossary&hash=LetterpressSLASHglossary&fq=myresources%7Ctrue" title="LetterpressSLASHglossary" target="_blank">
letterpress</a> tables <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">5B11. <span>Double</span> <span>
leaves</span> <span><a href="http://desktop.loc.gov/search?&view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=aacr22PERIOD5B11&hash=2PERIOD5B11&fq=myresources%7Ctrue" target="_blank"><span style="color:blue;text-decoration:none"><img src="cid:image001.png@01D0B198.EF0434C0" height="24" border="0" width="51"></span></a></span><u></u><u></u></p>
<p class="MsoNormal"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0992"></a>Count numbered
<span>double</span> <span>leaves</span> (<span>leaves</span> with fold at either top or fore edge and bound at the inner margin) as pages or as
<span>leaves</span> according to their numbering. Count unnumbered
<span>double</span> <span>leaves</span> as pages (2 printed pages per
<span>double</span> leaf) or as <span>
leaves</span> (1 printed page per <span>double</span> leaf). Always indicate the presence of
<span>double</span> <span>leaves</span> in a note.
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0993"></a>[36] p.
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><span><a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbNote&hash=Note&fq=myresources%7Ctrue" title="Note" target="_blank">Note</a><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0994"></a>:</span>
Printed on <span>double</span> <span>
leaves</span> <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0995"></a>[18]
<span>leaves</span> <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><span><a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbNote&hash=Note&fq=myresources%7Ctrue" title="Note" target="_blank">Note</a><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0996"></a>:</span>
Printed on 18 <span>double</span> <span>
leaves</span> <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0997"></a>72 p., 1 leaf of plates
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><span><a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbNote&hash=Note&fq=myresources%7Ctrue" title="Note" target="_blank">Note</a><a name="14e3b84b8749dbcf_dcrmbUNDERSCORE0998"></a>:</span> <a href="http://desktop.loc.gov/search?view=document&doc_action=setdoc&doc_keytype=foliodestination&doc_key=dcrmbPlateSLASHglossary&hash=PlateSLASHglossary&fq=myresources%7Ctrue" title="PlateSLASHglossary" target="_blank">Plate</a>
printed on a <span>double</span> leaf <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
<p class="MsoNormal">Deborah J. Leslie, for the DCRM/RDA Task Group<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
</blockquote></div><br></div>