Looking NW from 27th St. at McAlpine Locks.
<p>Second cut of tow of  "Brimstone" (doc. # 277557) entering 600-foot lock downbound.
HBL on barge refers to Houston Barge Line.
Thermal oil heater can be seen behind small boxy tank marked "Thermal oil only." Hot thermal oil is circulated around tanks of heavy liquid cargo like crude oil or asphalt to keep it "thin" enough to be pumped out. One currently-available (as of 2012) thermal oil heater is the <a rel="nofollow" class="external text" href="http://www.volcanic-heater.com/hopkins-2-pass-heater.php">Hopkins 2-Pass Heater</a>.
At left is housing for "<a href="https://en.wikipedia.org/wiki/Francis_Goold_Morony_Stoney" class="extiw" title="w:Francis Goold Morony Stoney">Stoney</a> gate" filling valve machinery.
Lock operator controls upper miter gates and filling valves from blue panel to right of yellow cart.
See <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/6791988437/">diagram of 600-foot lock at McAlpine</a> showing Stoney gates and culverts.
Ohio River mile 607.
Louisville, Kentucky.
Oct. 1987.
File # 87j070.
.
35 mm Kodachrome slide.
scanned with Plustek OpticFilm 7600i and Silverfast 8.
</p>
edited with Picture Window 4
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/7522745798/">87j070: tow of Brimstone entering 600-foot lock at McAlpine</a>