This is a fully interactive demonstration of the functionality of the 001. Rotate the bezel to convert common dimensions; for instance, try converting inches to millimetres. Actuate the pushers to run the chronograph and see all the calculated outputs for the Gravigraph, Thermograph, Chronograph and Telemeter.
The number under mm is 25.4 times it, at every position. The same holds for MPH and KM/H, for DIA and CIRC (the constant is π), for M and FT, and for KM and MI. Nothing is calculated; the angle between each pair of marks is the conversion. KM and MI share the KM/h and Mph pointers, because a mile is 1.609 km with or without the hour: the Mph pointer is also the miles mark, the KM/h pointer the kilometres mark.
The scale shows 3.75 under IN and 9.52 under mm. Whether that is 3/8 in to 9.5 mm or 37.5 in to 953 mm is yours to know, the way every slide rule has left it to you. There are no ticks between the numerals; you read between them by eye, which is honest at two figures. The blue sixteenths sit in the same row as the numerals, each on its own blue tick, and settle it for shop fractions; 1/2 lands exactly on 5, so the 5 keeps its numeral and its tick turns blue.
A tachymeter for gravity, named GRAVIGRAPH on the ring's mark row above its numerals, from its first mark. Start the chronograph as the rock leaves your hand, stop it as it lands: the red hand points at the height in metres, h = ½gt², 5 m a hundredth past one second, 44 m at three, 123 m at five, 490 m at ten, on round to 3,760 m at 27.7 seconds, where the scale ends level with the Dolbear scale's last mark; 6 o'clock belongs to the seconds track. Put that number under M and read feet under FT. Past about four seconds air resistance slows a real rock, so long drops read high; the far end of the scale is the formula, not a promise.
A telemeter, the old chronograph scale for artillery, printed here for lightning. Light arrives at once; sound covers 343 m a second. Start the chronograph at the flash, stop it at the thunder, and the tail of the red hand, which rests on 6 o'clock while the tip rests on 12, points at the distance on the dial edge: 1 km at 2.9 s, 3 km at 8.7 s, 10 km at 29 s, where the scale meets 12. A numeral every kilometre with its km, a tick every hundred metres, and at 6 o'clock, where the scale begins and the tail rests, the name TELEMETER on the line inside the numerals, running from the 6 o'clock marker toward 7, with a storm cloud on the other side of the first tick. Then put the kilometres under KM/h on the bezel and read miles under Mph; the ratio is the same with or without the hour.
A cricket thermometer, on the right half of the dial edge for the tip of the red hand, the mirror of the sound scale, named THERMOGRAPH in the band at the dial edge just before its first numeral, with 20 CHIRP in fine print right-justified under the name. Amos Dolbear's law of 1897: °F = 50 + (chirps a minute − 40) / 4. Time twenty chirps and the tip reads the temperature, 40 + 300 / t: 100 °F at 5 s, 80 at 7.5 s, 70 at 10 s, 60 at 15 s, 55 at 20 s, 53 at 23.1 s, 51 at 27.7 s where it ends, level with the Gravigraph's 3,760; every numeral carries its °F. Calibrated for the snowy tree cricket; below about 50 °F crickets go quiet, which is where the arc stops. The Style box swaps it for a quarter-mile tachymeter (900 / t mph: 120 at 7.5 s, 60 at 15 s, 36 at 25 s, named TACHYMETER with 1/4 MI under it and MPH in the small print), so the whole arc is a drag strip.
Reading error is about one percent on the bezel, and a fifth of a second on the chronograph is about a tenth of the height at short drops, or seventy metres of thunder. This replaces reaching for a phone, not a surveyor.
A plain bar the full width of the dial, with a rounded-square window cut into it that frames the P mark when the hand is at rest. The window rides with the hand, so whichever end carries it is the tip; the other end is the tail that reads the sound scale. For the first half minute the tail also reads seconds: from 6 o'clock on, each 5 s index on the ring carries a pair, the tail's numeral left of the tick and the tip's right of it, 0|30 where the tail rests, 5|35, 10|40 and on to 25|55, then 30|60 under IN, where the tail is while the tip counts up the drop scale.
The hour and minute hands sit at 10:37, the drawing's pose, while the small seconds at 9 never stops and the chronograph waits at 12; the date sits in a window at half past one, between the 1 and 2 o'clock markers, on a wheel matched to the dial, and the crown sets it: roll it up for the next day, down for the one before. The counter at 9 is numbered 60, 15, 30, 45. The 30-minute counter at 3 has a tick a minute and is numbered 10, 20, 30; its first eight minutes are double-weight ticks half the usual length, each ending in a pin head with a smaller head on it, a row of snowmen, an eight-minute sketch round, and its last five carry a red REST plate, 0.9 mm deep and edged in Drafting White, with the word set along its curve and nothing else inside it, the break at the end of a 25-minute Pomodoro; its 10, 20 and 30 are large hairline numerals, 1.19 mm Archivo Thin. The hour markers are the P mark's stem, a 2.3 mm bar with its outer-left and inner-right corners cut on the diagonal, applied with a lume centre or printed in the dial's ink according to the style.
The demo fits one screen: the watch over four tabs. Watch is the watch alone, Readings the live readouts in one line each, Style the style controls, Notes this text. Turn the phone on its side and the panel sits beside the watch.
Carbon Fiber is the default. The Style box carries the seventeen dial studies from the prototype.watch mockups as presets, Blueprint Blue to All Black, and lets you change each layer on its own: the dial and its texture, tonal, black or white counters, printed or applied batons or numerals, sword or baton hands, red, orange or tonal seconds hand, six straps, and a night view with the lume lit. The bezel, its marks and the fixed ring are the same in every style; only the dial inside them changes, and the bezel keeps its position when you switch. The Seconds quadrants select quarters the running-seconds counter into 15-second sectors, the first and third in a second colour; each of Tonal, Blueprint, Signal, Field, Brass and Titanium is a family that takes a dark or a light form to suit the preset's counter, JaM is always Signal Red and Blueprint Blue, Fire Extinguisher Signal Red and Signal Orange, CrashTest yellow and black, Greybies always a dark and a light grey with the numerals switching ink over the light sectors, and the choice stays on as you move between presets; Carbon Fiber opens in Titanium.
Breitling Navitimer Automatic 41: 41 mm, 11.65 mm thick, 46.9 mm lug to lug, 22 mm lugs; the scale ring turns under the crystal, driven by the beaded bezel. Sinn 903 St II: 41 mm, 14.5 mm thick, 48.5 mm lug to lug; the outer bezel turns the inner ring, and reviewers call the time dial "comparatively small". Citizen Nighthawk BJ7000: 42 mm, 13 mm thick, 47 mm lug to lug, 22 mm lugs; internal ring turned by a crown at 8. Seiko Flightmaster SNA411: 42 mm, 13.2 mm thick, 44 mm lug to lug, 20 mm lugs; a printed bezel outside the crystal leaves a 32 mm dial and "small type". Dive bezel inserts on 42 to 45 mm Seikos are 3.1 to 4.1 mm wide.
Two printed rings, one row each where it can be. At 42 mm: bezel 2.9 mm per side (0.8 mm coin edge, 1.8 mm printed, 0.3 mm lip) carrying numerals and fractions in one row; 36.2 mm crystal; one fixed black ring of 2.1 mm with the eight pointers on its outer edge, each named beside its pointer (Mph and KM/h, with the ph and /h small, doubling as the miles and kilometres marks), and the drop scale in a single row inside them; 31.6 mm working dial; 22 mm lugs, 48 mm lug to lug, 6 mm crown. At 40 mm the rings stay the same width, so the crystal is 34.2 mm and the working dial 29.6 mm. The previous layout stacked five rows (numerals, fractions, mark labels, and two staggered drop rows) across 7.1 mm; this one stacks three across 5.0 mm, which is where the 4.2 mm of extra dial comes from. Type: bezel numerals 1.1 mm, fractions 0.66 mm, mark labels 0.7 mm, drop scale numerals 0.62 mm, P mark 1.7 mm tall. Printing below about 0.6 mm is not reliable, so the drop scale is at the limit; the temperature rows in the other mock-up are too, and that mock-up needs a 2.7 mm ring for its two rows.
The True size switch draws the watch at nominal millimetres; browsers assume 96 dpi, so hold a ruler to the screen and expect it to be close, not exact. At that size the bezel numerals are the height of the date numerals on an ordinary watch and the mark labels are smaller still. Sharing a row cost the bezel one numeral, 1.9, which sits 2° from 3/16, and three fractions are printed a touch to one side of their tick where a numeral is close. That is the real trade: four windows, a fraction track and a drop scale on a face that is now mostly dial, or a calmer face still.
Specimen
Bezel: one decade per lap, one row of black numerals and blue sixteenths with a tick under each at the inner edge, the index a full-width triangle carrying the 1, bidirectional friction, printed outside the crystal, 2.9 mm per side. Fixed ring, under the crystal, 2.1 mm: eight pointers on its outer edge, IN 350°, CIRC 29.0°, M 99.0°, MM 135.7°, Mph 173.0°, DIA 210.0°, KM/h 247.4°, FT 284.8°, spread for the widest spacing possible (36.7° minimum) and turned 10° back as a block so the ring's name has its room after IN; Mph and KM/h are printed with the ph and /h at 0.68 size, lowered like a subscript, and double as the MI and KM marks since the ratio is the same; on the mark row, in the numerals' white, the name GRAVIGRAPH (0.7 mm IBM Plex Mono, the pointer names' size) from the line of the scale's first mark; inside them, in one row, the drop scale ½gt² from the 5 m mark (1.01 s) to 27.7 s at 6° per second, ending level with the dial-edge scale's last mark at 3,760 m (its own last mark, 13.8° short of 6 o'clock), labels every second to 10 s and every two seconds after on a baseline arc with the ticks hanging inward, plus a seconds track from 29 s for the rest of the lap: at each 5 s index a pair of 0.72 mm numerals either side of the tick, which runs up through the row, the tail's on the left and the tip's on the right, 0|30 at 6 o'clock, 5|35, 10|40, 15|45, 20|50, 25|55 and 30|60 under the IN mark (FT's name sits before its pointer). Dial: 31.6 mm, P mark at 12, PROTOTYPE 001 at 6. Thermograph (the Dolbear cricket scale) on the dial edge from 12 down the right side, °F = 40 + 300/t for twenty chirps, 0.62 mm numerals with their °F at 0.5 mm ticks, 100°F, 80°F, 70°F, 65°F, 60°F, 55°F, 53°F and 51°F at the end (27.7 s), medium ticks at 95, 90, 85, 75, 62, 58 and 52; in the band at the dial edge, level with the ticks, THERMOGRAPH (0.7 mm Plex Mono, the size of all three scale names) ending 0.4 mm before the 100°F, with 20 CHIRP right-justified under it in 0.32 mm fine print; a quarter-mile tachymeter (900/t mph, 120 to 32.5, TACHYMETER with 1/4 MI right-justified under it and MPH in 0.4 mm small print inside the row) takes its place from the Style box. Sound scale on the dial edge from 6 o'clock to 12 up the left side, 343 m/s, a long tick and numeral every kilometre, a medium tick at the half and fine ticks at tenths, 10 km at 29.2 s, each numeral with its km, the name TELEMETER (0.7 mm Plex Mono) on the line 1.7 mm inside the dial edge, under the numerals, from 0.4 mm past the 6 o'clock marker toward 7, and on the Thermograph's side of the first tick a storm-cloud icon (a cloud outline with a bolt across it, 0.91 mm, upright to the wearer, floating between the dial edge and the numeral row); hour markers inset 1 mm to clear it. Chronograph: central seconds in Signal Red, the one red element, a full diameter: a 0.3 mm bar opened into a 2.4 mm rounded-square frame (0.14 mm stroke) that sits round the P mark when the hand rests at 12, which marks the tip; the tip meets the drop ticks on the ring and the tail the sound ticks on the dial; pushers at 2 (start, stop) and 4 (reset); 30-minute counter at 3 numbered 10, 20, 30 with a tick a minute, minutes 1 to 8 as 0.425 mm ticks at double weight with a 0.26 mm pin head on the inner end with a 0.2 mm head overlapping it on top, and a 0.7 mm plate in the hand's red over minutes 25 to 30, edged in Drafting White and reading REST in it; numerals 10, 20, 30 at 1.19 mm in Archivo Thin. Time of day on the hour and minute hands; running seconds at 9 numbered 60, 15, 30, 45; date window 3.4 × 2.4 mm at half past one (45° from 12, 11.85 mm from the pivot), colour-matched wheel, numeral upright, with a T-minus tab against its left edge: a half-round tab in the dial's ink, the frame's height, a blocky T and a dash cut out of it so the dial shows through, the pair reading "T- 10". Hour numerals 12, 3 and 9 at 4.65 mm on every dial, each placed by the ink of its glyphs so the outer edge of every numeral sits 1.93 mm inside the dial edge and the 3 and 9 are centred on their axis, the P mark lowered to 9.2 mm to clear the 12; the other hours are the P-stem marker, 2.3 × 0.55 mm, the diagonal cuts spanning the width. Styles: seventeen presets from the prototype.watch dial studies, Carbon Fiber by default, each a mix of dial, counters, markers, hands, seconds hand and strap; the bezel and fixed ring are fixed for all of them. Case: 42 mm (40 mm selectable), one crown; strap per style, black sailcloth with Carbon Fiber.