Rear-side thermometer could be something like this:

Bimetalic Stemmed Thermometer

Bimetalic Stemmed Thermometer

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Main Parts of HSG

The fundamental parts are:

  • wooden or plastic body (rectangle in version 0.1.1, circle in version 0.1.2)
  • polon (a stick generating the shadow, removable in later versions)
  • compass (necessary to find out a South direction exactly)
  • metalic or wooden joint (to let the HSG closed in “sleep-mode”, later versions contain a shelter for dismounted polon)
  • metalic chain (to attach the HSG to clothing or to another stuff)
  • a bubble (to keep the HSG vertically to meridian, or the plumb line in earlier versions)