The BEST Episodes of The Secret Life of Machines

Every episode ever - ranked by fan votes!

Last Updated: Jun 14, 2020

Network: Channel 4

Tim Hunkin explains how the machines we use every day actually work, using a fascinating combination of experiments, analogies, animation, and larger-than-lifesize working models. The TV series was the outgrowth of a series of cartoons for the Observer newspaper called "The Rudiments of Wisdom", which Tim researched and drew for 14 years. The theme music is a version of Dave Brubeck's "Take Five" by Val Bennett, retitled "The Russians are Coming".

The Radio Set

#1 - The Radio Set

Season 2 - Episode 5 - Aired Feb 5, 1991

Any electrical spark creates radio waves and acts as a transmitter. You hear sparks on a radio as interference. That's why lighting makes radios crackle, and even the tiny spark in a switch is enough to make a noise on the radio when turning on a light. Episode Contents: Models: Toilet tube crystal set. Machines: Lovely little (1 metre long) RC car made by Rex for kids show. Guests: A Hertz induction coil and loop reciever. Early Marconi radios. Antique BBC transmitter (c.1920) and it's modern equivalent. Various antique sets and accessories. Films: The cartoon life of young Marconi and an old Armstrong. An ad for 1950 plastic RCA portables. Extro: Motorized novelty radios.

star 10.00
27 votes
The Word Processor

#2 - The Word Processor

Season 3 - Episode 2 - Aired Feb 25, 1993

The name 'Word Processor' was invented by IBM. Their first machines were very difficult to use because they had no screen. A draft version was typed and stored on a magnetic card. After correcting the draft it could be automatically retyped, stopping wherever a change was needed. Episode Contents: Models: A bag full of LEDs are soldered to the pins of a microprocessor to show the massive switching going on inside. Machines: Some befuddled computer shopping automatons. A huge sloppy hand held ink jet print head by Rex. Guests: Various pre-qwerty antique typewriters. A 70's era micro with punchcard storage. Films: Old footage of early computers. Some goofy old 70's promotional video. Extro: A huge tractor feed spewing robot made of old computer hardware.

star 10.00
27 votes
The Car

#3 - The Car

Season 2 - Episode 1 - Aired Jan 8, 1991

Cars started to become popular in the 1890s. Their success was partly due to the bicycle, which had given people a taste for a personal means of transport. It was also due to Daimler's high speed engine, the first internal combustion engine to be small enough not to make a vehicle ridiculously cumbersome. Episode Contents: Models: A gutted modern body shell. A running car stripped down to the chassis. An exposed brake glows as it's applied. Machines: A mini that drives away from itself! Guests: A penny farthing and other antique bicycles. A 1902 Woolsey. Films: The cartoon life Daimler und Benz. Some quaint english promo films for early cars and lots of assembly line footage. A late 40's ad for a "FUTURAMIC" oldsmobile. A 60's advert for an Austin mini. Citroen promo film showing the toughness of the bodyshell design. Extro: Crushing defeat.

star 9.00
54 votes
The Internal Combustion Engine

#4 - The Internal Combustion Engine

Season 2 - Episode 2 - Aired Jan 15, 1991

The first internal combustion engine was made by a Frenchman called Etienne Lenoir in 1859. He simply modified a steam engine to suck in and ignite the inflammable gas from his gas lights. Unfortunately the explosions were very violent and the engine was very inefficient. Episode Contents: Models: A gasoline powered lager can mortar. A cutaway model shows the fundamental features of the engine: piston, valves, etc. Machines: An odd little vehicle with a hydraulic life made for a tv show. Guests: A tiny model airplane engine shows amazing power/size ratio. A Hornsby Ackroyd (c.1895) engine runs on parafin. Films: 40's promotional clips for car culture... Cartoon lives of Otto and Diesel. Extro: Motor mad disciples carry an offering to Carhenge!

star 9.00
54 votes
The Sewing Machine

#5 - The Sewing Machine

Season 1 - Episode 2 - Aired Nov 22, 1988

The first patent for a sewing machine was taken out by an English cabinetmaker called Thomas Saint in 1790. It's doubtful whether he actually built his design, because, when one was made from his drawings 100 years later, it had to be extensively modified to work. Episode Contents: Models: A giant human powered lock stitcher demonstrates the basic idea. A cut away singer shows how a crank powers all the basic functions. A demonstration of cams and stepper motors. Machines: Three of Tim's famous collecting boxes: The head scratching curator the rubber-necked guard and the doctor that writes out illegible prescriptions. There are some brief close ups of the construction of these machines. Rex also shows his magical remote controlled suitcase. Guests: A thumb crushing Thimmonier (the 1st practical sewing machine) Many antique decorative sewing machines. Films: The old Singer advert from the 40's is probably the funniest clip in this series. Extro: Say it in thread.

star 8.00
27 votes
The Fax Machine

#6 - The Fax Machine

Season 3 - Episode 5 - Aired Mar 18, 1993

The world's first fax machine was patented in 1843 by Alexander Bain. He came from a remote croft in Caithness in Scotland and, for his early experiments, used cattle jaw bones for hinges and heather for springs. His fax machine was based on an electric clock, which he had also invented. Episode Contents: Models: The "human fax" had Tim and Rex stand at opposite ends of a big field. Tim steps slowly over a sheet printed with giant letters of a message and uses coloured paddles to signal Rex who walks over a similar large sheet with a paint roller, applying paint when he sees the signal. Everything is synchronized with a metronome. The next model uses a board with nail at one each end which closes a circuit in contact with raised metal type. The current causes the nail at the other end to heat a sheet of paper soaked in potasium ferra cyanide. A "string fax" consisting of two drums shows how a picture can be transmitted one line at a time. The "lathe fax" uses a light detector hooked up to a buzzer which is then transmitted through the headset of a normal phone. A lathe at the other end has a sound switch which sends a current through the treated paper at every pulse from the sender lathe. The 2nd "human fax" emulates a digital fax with large grids placed over both Tim and Rex's sheets. Guests: A pair of French Pantelographe de Casell c.1860. A hydrogen balloon used for weather telemetry. A modern fax analyzer. Films: Cartoon life of Alexander Bain (patenter of the fax 150 years ago). Old newsreel featuring early developments in newsgathering. 70's xerox office fax ad. Extro: Tim's homemade Pantelograph.

star 8.00
27 votes
The Washing Machine

#7 - The Washing Machine

Season 1 - Episode 4 - Aired Dec 6, 1988

The earliest form of automatic washing was the nautical practice of towing clothes behind the ship. The combination of agitation and a constant flow of clean water washes the clothes quite effectively. Episode Contents: Models: Solenoid valves and pressure switches explained. Various cut away washing machines and their ingredients: weighted base, heating element, pumps, timer. Machines: A thunder simulator by Tim. A stunt by Rex using a solenoid cannon to roll a car. One of the best of Tim's collecting boxes, the Chiropodist who nods, twiddles her thumbs and then dissapears and tickles your foot (automatic british mickey taking at it's best). Guests: Again, lots of antique specimins (including the canadian shocker!). Industrial washing machines and the way they deal with the eccentricities of a load of water. Extro: A mountain of washing machines.

star 7.90
27 votes
The Vacuum Cleaner

#8 - The Vacuum Cleaner

Season 1 - Episode 1 - Aired Nov 15, 1988

Before the invention of the vacuum cleaner, carpets and upholstery were taken outside and beaten once a year to get the dust out (the 'Spring' clean). Fitted carpets were totally impractical. Episode Contents: Models: Three different kinds (cylinder, upright, hybrid) of cut away vacuums. Homemade solenoid. Plastic bag car jack. Machines: Tim's automated hair raising, eye rolling portrait. Tim's "Common Ground" collecting box which simulates different footprints using a vacuum and a sheet of rubber. Guests: An array of ineffective hand powered vaccuums. Films: Singin hoover ad from the 30's. Extro: Flying vacuums!

star 7.50
54 votes
The Office

#9 - The Office

Season 3 - Episode 6 - Aired Mar 25, 1993

Today, over 50% of jobs are in offices, but 160 years ago the figure was only 1%, and the only office workers were 'Dickensian' clerks. They had considerable status and freedom to organise their work, and kept financial ledgers, but there were no forms, memos, reports, etc. Episode Contents: Guests: The suspended ceiling conceals all the ventilation and lighting systems. A tour of the inner workings of a typical office building. Films: Cartoons about what makes a good office. Gilbreth's time and motion films. An poetic little film from the 40's about progress and change. An excerpt from a goofy 50's educational film regarding the human relations approach to management. Zombies from the 70's demonstrate new computer systems. Extro: An amazingly active office scene where everything (computers, desklamps, binders, papers) seems to be attached to actuators.

star 2.00
27 votes
The Central Heating System

#10 - The Central Heating System

Season 1 - Episode 3 - Aired Nov 29, 1988

At first Roman houses simply had a fire in the middle of the room (the Latin for hearth is focus). But they probably had trouble with smoke as the Latin for living room is atrium (from ater meaning black). By about 400AD the Romans had perfected a form of central heating. The fire was lit outside in a furnace with hot air ducts under the floors and in the walls. Episode Contents: Models: Trying to start a fire with an electric drill. A Norman chimney vs a proper one. A life size 2 dimensional house model with radiators and boiler. A glass radiator. A balanced flue. Machines: Jacob's ladders by Rex. Guests: Solid fuel, oil and natural gas boilers. Films: Yet another silly 40's promotional film, this one for the Ascot gas boiler. Extro: The model house springs a leak.

star 0.00
0 votes
The Refrigerator

#11 - The Refrigerator

Season 1 - Episode 5 - Aired Dec 13, 1988

Commercial refrigeration equipment was first developed in Australia, where the winters weren't cold enough to produce much natural ice. A brewery was the first company to commission an artificial ice making plant (in 1865) so cooling Australian lager was the first use of artificial refrigeration. Episode Contents: Models: Disassembling a compressor. Demonstration of thermostat Machines: Rex's homemade air rifle. Tim's elaborate wall mounted water clock. Guests: Early ice box. A turn of the century ammonia refrigerent ice factory. Various early fridges. Archival: GE film from 1935 starring Bette Davis. Hilarious old promo from 1957 with a woman hugging her fridge! Goofy commercial involving an elephant and an old style fridge. Extro: Stop motion fridges.

star 0.00
0 votes
The Television Set

#12 - The Television Set

Season 1 - Episode 6 - Aired Dec 20, 1988

John Logie Baird, the Scottish inventor, developed an electromechanical TV system in the 1920's and gave frequent public demonstrations. The publicity encouraged EMI to develop a practical all-electronic system, similar to today's. In 1936 the BBC transmitted both systems, but EMI's was judged superior. Episode Contents: Models: TV scanning is demonstrated with a drawing made on many strands of string. A cutaway TV and cards that mimic the screening of a colour TV. Explanation of the simplest electronic components. Machines: Tim's displays at the National Film and Television Museum (UK) Guests: British TV sets from before and after WWII. Films: Zworykin interview. J.L. Baird cartoon. Extro: A mountain of live televisions set on fire.

star 0.00
0 votes
The Quartz Watch

#13 - The Quartz Watch

Season 2 - Episode 3 - Aired Jan 22, 1991

All clocks and watches work by 'counting' some event which takes a fixed period of time, like the swings of a pendulum. The higher it goes the stronger the pull of gravity and the faster it comes back - so the swings always take a fixed time. The Quartz crystal in a watch vibrates at a fixed speed in a similar way. Episode Contents: Models: A stick. Demonstration of liquid crystal technology with metal coated glass plates and polarized sunglasses. Machines: Many of Tim's large outdoor clocks. A water clock by Rex. Guests: A 400 year old pendulum alarm clock. Various antique pocket watches. Different watch models track the evolution of quartz and digital watches. Films: Goofy 1940's wristwatch commercial ("Hey kids come on a running!") Almost as silly 70's ad for the first bulky LED watch. Extro: Oven door blooper and a melting digital watch.

star 0.00
0 votes
The Telephone

#14 - The Telephone

Season 2 - Episode 4 - Aired Jan 29, 1991

The forerunner of the telephone was the telegraph. By 1870 all major towns in Europe and America had telegraphs, sending messages in 'on' and 'off' pulses (e.g. Morse code). It was while trying to improve the telegraph that Bell discovered the telephone. Episode Contents: Models: A tiny telephone system (less power supply!). A speaker using solenoid coil, magnet and base drum. A homemade microphone of plastic lid and carbon particles Machines: A cheeky store automaton that induces rabid commercialism. An acoustic probe by Rex. Guests: Several old telegraph machines using odd protocols. A 60s era mechanical "click and bang" telephone exchange (they are fun to watch). A funky 30's era burglar alarm complete with telephone dialer and a message for the police on the phonograph. Films: The cartoon life of that famous scot/canuck Alexander Graham Bell. An all singing all dancing Bell film promoting a phone every five feet. Extro: Stop motion phones.

star 0.00
0 votes
The Video Recorder

#15 - The Video Recorder

Season 2 - Episode 6 - Aired Feb 12, 1991

The principle of magnetic recording was invented by a Danish telephone engineer called Valdemar Poulsen in 1899. He used an electromagnet to record the tiny electric currents from a telephone to magnetise a steel wire. This recreated tiny currents in the electromagnet when it was replayed. All tape and video recorders still work this way. Episode Contents: Models: A band saw magnetic recorder. Recording a signal on scotch tape covered in rust (FeO^2) particles. A large model of a VCR type head and it's concentrative powers. Illustration of helical scanning. Machines: Great intro scene by Tim and Rex (e.g. slanting cupboards, man eating garbage disposal, rabid mailman, dogfood eating kid, and the oblivious housewife). Rubber band powered beavers. Guests: An early Paulson wire tape recorder. A really impressive German "tapedeck" (c.1930) that used razor sharp steel bands running at high speed under high tension. An airplane black box. A 1940's German tape machine the Tonstreiber (sp?). Ampex VTR's at the BBC. A range of major domestic video formats. Films: The earliest video recordings. A dramatic illustration of generational loss in VHS (re)recordings. Sad adult cartoon characters trying to program their VCR. Extro: Very odd living room scene with mechanically animated knick knacks, spinning stools, tippy stereo components etc.

star 0.00
0 votes
The Lift

#16 - The Lift

Season 3 - Episode 1 - Aired Feb 18, 1993

The Colosseum in Rome is thought to have had a lift to carry the Emperor Nero to his balcony. By the 18th century, Mr Villayer was touring the palaces of Europe installing lifts called flying chairs. He disappeared shortly after an heir to the French throne had a serious accident in one at Versailles. Episode Contents: Models: A flimsy looking bicycle wheel pulley. Replicas of the Elisha Otis elevator in several scales. The biggest damn micro switch I have ever seen! A water powered hydraulic lift. Machines: Tim's Goldbergesque executive decision maker. Guests: A modern motorized capstan. A wire rope tester utilizing a gigantic hydraulic ram. The insides of a modern elevator system with governor, brakes, motor and various detectors. They also check out a computerized simulator to work out elevator usage patterns. Films: The cartoon life of Elisha Otis. Extro: A flying box!

star 0.00
0 votes
The Electric Light

#17 - The Electric Light

Season 3 - Episode 3 - Aired Mar 4, 1993

A Scottish chemist called Joseph Swann tried passing electricity through fine wires (filaments) to make them glow white hot in 1860. Despite enclosing them in bulbs and pumping out the air, they quickly broke or blackened and Swann abandoned the idea. 17 years later, finding a better vacuum pump, he tried again. With no air left inside, the filament light bulb became a practical proposition. Episode Contents: Models: Some lightbulbs made by removing the air from milk bottles and adding graphite filaments powered by a welding power supply. Various experiments with phosphors. Machines: "Magical" bulbs by Rex. Guests: Some early arc lights. Decorative experimental florescent tubes from the 1860's. A range of modern lighting sources and how their spectrums look. Films: Ancient lighting cartoon. A wacko british lightbulb ad. Extro: Say it in lights.

star 0.00
0 votes
The Photocopier

#18 - The Photocopier

Season 3 - Episode 4 - Aired Mar 11, 1993

James Watt, the inventor of the steam engine, patented the first copying machine, because of the disastrous inaccuracies that had occurred due to copying drawings by hand. Drawings to be copied were written in a special ink which bled into the copy when squashed through a mangle. Episode Contents: Models: Electrostatic copying with homemade sulphur plates. A desktop illustration of the mechanics of projecting an image onto the selenium drum. Machines: A Van De Graaf generator by Rex. Another automaton by Tim called the General made from lots of copier goodies. Guests: Various pre-xerox copiers; 50's thermal copiers, 20's wax stencil duplicator, Victorian copy books. Also the blueprinting method used for technical drawings. An early electrostatic copier, the 1385. A modern colour copier. Films: Some funny cartoons about static electricity. Old interviews with the inventor of xerography Chester Carlson. An amazingly trashy Japanese copier tv advert. Extro: A scrap paper yard.

star 0.00
0 votes