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All or nothing. This project will only be funded if it reaches its goal by .

$37,571
pledged of $39,725 goal
backers
Back this project
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All or nothing. This project will only be funded if it reaches its goal by .

About this project

Caliper Timepieces is back with a new project inspired by mid-twentieth century instruments. The 'Caliper Slide View' combines a self-winding mechanical watch with an icon of pre-electronic technology: the slide rule.

The 'Caliper Slide View' watch and circular slide rule
The 'Caliper Slide View' watch and circular slide rule

In 2016 the ‘Caliper View’ watch was launched on Kickstarter. The design was based on the look and feel of precision tools from the 50s and 60s. The same aesthetic theme inspires this new project: another beautifully made mechanical device. 

 

 

The lower crown controls the slide rule under the crystal
The lower crown controls the slide rule under the crystal

The circular slide rule allows you to multiply and divide numbers. You can also set it up as a handy conversion tool for units of measure or currencies. 

The Caliper circular steel slide rule
The Caliper circular steel slide rule

Every watch includes a 3 inch (8 cm) circular steel slide rule. To ensure you can make the best use of both slide rules, we're including instructions. After all, using a slide rule has become a lost art.

In the Media:

 

"Caliper has already shipped its minimalist watches after a few successful Kickstarter campaigns and I’m really pleased with this one. It’s very rare to find a unique timepiece with a unique complication." Read More>>  

- John Biggs, Tech Crunch

 

 "The movable internal bezel dominates and defines the watch, and I have to say, it is pretty cool." Read More >>

- The Time Bum

 

"Get more out of your timepiece when you wear the Caliper Slide Rule Mechanical Watch. This watch features an impressive tool: an integrated slide rule." Read More >>

- Ashley, The Gadget Flow

 

"A clever design and striking timepiece in its own right have made this a thoroughly impressive construction in our opinion here at The Coolector and for those of you that demand more than the norm from your watches, this will be right up your street." Read More>>

- Leo Davie, The Coolector

 

"They plan on shipping in February 2018 but I saw a working model complete with circular slide rule and was very impressed." Read More>>

- John Biggs, Wrist Watch Review

 

Using a Circular Slide Rule

With a bit of practice, you'll find it a useful tool. 

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Example: Multiply 35 times 6  

To multiply two numbers, align the first number to the arrow at 1. Find the second number on the same ring as the arrow and read across to find the result.

Multiply 35 times 6
Multiply 35 times 6

Example: Divide 450 by 6  

To divide a number by another number, align the two numbers to each other. Read the result across from the arrow on the ring with the number you are dividing by – the ring with the denominator.

Divide 450 by 6
Divide 450 by 6

 

Conversion factors on the rear of the steel slide rule
Conversion factors on the rear of the steel slide rule

 We've posted more instructions here.

Inspiration

Caliper Timepieces harken back to the era of precision instrumentation - when the inner mechanics of our most important tools and devices were crafted for accuracy, dependability and longevity. Caliper Timepieces are a tribute to all that came before the planned obsolescence of the consumer age.

Technical instruments before the age of electronics
Technical instruments before the age of electronics

 Prototype Versions

We have developed two prototype versions of the Caliper Slide View. The A1O features a black case and black interior slide rule with a dark, semi transparent watch face and an orange second hand:

 

Version A1O
Version A1O

The Caliper Slide View D1B features black case and white interior slide rule with a dark, semi transparent watch face and an blue second hand:

 

Version D1B
Version D1B

 

Proposed Additional Versions

Based on feedback from backers and others, we are developing three more options. These three are proposed designs that may evolve slightly so we would love to hear your feedback and suggestions.  

Version B3O features a brushed stainless steel case and band. The face is a crisp opaque white face with black markers. We’ve included a set of common conversion factors on the face in a circle.

Version B3O
Version B3O

 Version B4O is a stainless steel watch with a white slide rule and clear glass watch face. The hands will be white with lume and the hour and minute markers will be black over clear glass.

Version B4O
Version B4O

Version D2B is a black case version with a white slide rule and a set of conversion factors printed on the glass face in two blocks at 3 and 9.

Version D2B
Version D2B

 

 

Steel circular slide rule with conversion factors on reverse side
Steel circular slide rule with conversion factors on reverse side

Technical Specifications

The Caliper Slide View is a sophisticated machine. Our aim has been to develop the best watch and slide-rule that we could offer at a retail price under US$500. Kickstarter backers will be able to get it for substantially less.

We've selected the Japanese made Miyota 82S0 as the movement for the Slide View. This is a reliable and well-regarded movement. A key feature of this little machine is that it has an 'open heart' - the balance wheel and escapement are visible from the front. The movement is purely mechanical and requires no battery. It is self-winding, which means that the motion of your daily activities provides the power to keep it running. 

The case is milled from a very high quality steel know as 316L. The black surface is applied to the steel using a process called IP (ion plating) which is a form of PVD (physical vapor deposition). It's a very tough coating that is chemically bonded to the steel. The watch is designed to be water resistant up to 10 atmospheres of static pressure. 

The glass on the front - the crystal - is sapphire which is will prevent it from getting scratched. We've also included glass on the back to show the inner workings. The watch face at first appears to be a simple dark grey surface, but you soon discover that it is made of dark glass and that you can see the movement ticking away underneath.

The Caliper Slide View utilizes screw-down crowns. This feature will make the watch more secure and robust - in that the crowns will be screwed into the case while not in use. For the slide rule, it will also ensure that the scale is not accidentally moved – a crucial factor if you’ve set up your watch for currency or unit conversion.

Screw Down Crowns
Screw Down Crowns

 

Caliper Slide View Dimensions - Units are 1/100 mm
Caliper Slide View Dimensions - Units are 1/100 mm
  • Case milled from 316L steel  
  • Black surface applied as ion plating (IP)
  • Sapphire scratch resistant glass  
  • Glass on back of case  
  • Semi-transparent watch face 
  • Case diameter 43mm  
  • Case thickness 13mm  
  • Water resistant to 10 ATM (100m)  
  • Screw down crowns
  • Miyota 82S0 movement  
  • Manual and self-winding  
  • 21 Jewels  
  • 21,600 vibrations per hour  
  • 40+ hours of running time
The motion within is visible through the semi-transparent watch face.
The motion within is visible through the semi-transparent watch face.

 

 Warranty

 

 

Caliper Slide View packaging
Caliper Slide View packaging

Timeline

The Caliper Slide View has been in development for over a year and we have gone through a series of three functional prototypes. We've subjected our prototypes to rigorous testing and daily use. We're ready for a full production run.

Estimated Project Timeline
Estimated Project Timeline

We anticipate that we will be able to deliver watches to backers in early 2018.

Risks and challenges

As this is our second watch project, we are familiar with the risks involved in launching a new watch:

The project timeline is subject to delay for various reasons:
- The availability of movements can be an issue. We will endeavor to to reserve an adequate number of movements as soon as we know the project will be funded.
- Manufacturing delays of other parts can be an issue. We have added contingency time to the project and we will keep all our backers updated of production progress.
- Flaws may be discovered during our quality control phase. We will inspect and test every watch before we forward them to backers. If issues are found, there may be some delay before deficiencies are rectified.

The slide rule is a new design feature for us. To ensure that it works well, we have evolved the design through three stages of functional prototypes and subjected them to rigorous testing.

We will be offering a three year warranty on these watches. We will stock a significant quantity of spare parts and replacement units for use in supporting this warranty.

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    Circular Steel Slide Rule

    Approx. $US59
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