Monday, June 25, 2018

A newsie writes about engineering history

Saturday's Wall St Journal had book review of Richard Rhodes "Energy a Human History".  The reviewer was Charles R. Morris.  Reading Morris's review made it clear to me that Mr. Morris is one of those "cannot change a light bulb" newsies.  For instance, Morris is describing early steam engine operation.  Morris says " Steam was pumped into the piston".  Not so.  The piston is a round metal part that moves back and forth. No where for steam to go into.  The piston moves inside the cylinder, into which steam can go.  Any motor head, like me, knows the difference between pistons and cylinders. Apparently Mr. Morris does not.  Plus, you don't pump steam into anything.  Just open the intake valve and steam under boiler pressure will flow in freely.  No pump required.
   Then Mr Morris writes "Franklin's famous wet-kite experiment demonstrated that ordinary static electricity and the same stuff as lightening by capturing its charges in Leyden jars, primitive batteries."  Not so.  The Leyden jar was an early version of a capacitor, not a battery.  Improved versions of the Leyden jar were called condensers up until the 1950's when the name capacitor was introduced.  All your electronics, TV, stereo, smart phone, desktop, whatever, contain lots and lots of capacitors. 
   And then we read "DC systems drew their power from low-voltage battery storage."  "DC was dependent on battery charging, it had limited range, only a half mile or so."   Not so.  Both DC and AC systems obtained their power from steam driven DC generators or AC alternators.  Edison's first commercial power station at Pearl St in New York city  had a generator.  So did all the later power stations, both AC and DC.  It isn't right to say that DC has limited range.  The right thing to say is that there was/is  no way to change the voltage of DC.  For transmission over distance, you want to set the voltage as high as you dare, thousands of volts, to reduce line losses.  Once the electricity gets to where is was going, you want to reduce the voltage.  Nobody wants thousands of volts in their lamp sockets and wall outlets.  A hundred volts or so is plenty running around your house.  With AC, transformers can change the voltage up for transmission and and then down again for use.  Transformers only work on AC.  Which accounts for the universal use of AC by today's electric companies. 
  "the disgraceful story of leaded gas-its toxicity especially on the brains of children."  Not the problem with leaded gas.  When we got serious about cleaning up the smog problem we put catalytic converters on all our cars.  Leaded gas poisoned the catalyst rendering the converters inoperative.  So the industry switched over to unleaded gas some time in the late 60's to early 70's.  They put smaller fill pipes on cars requiring unleaded so the standard leaded gas nozzles would not fit, and put smaller nozzles on the unleaded gas pumps. 
   I was surprised that the usually dependable Wall St Journal would publish a piece with so many glaring errors.

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