Sliding Caliper (Martin type)
GPM Model 104 Price: $989
Product Details
The GPM Martin type Sliding Caliper consists of a thick, metal vertical bar with a recording strip graduated in millimeters from 0 to 20 cm for length measurements, and from 0 to 5 cm for depth measurements
One of the two horizontal branches is fixed to the vertical bar, and the other slides smoothly up and down the vertical bar to ensure a precise measurement of length and depth.
The Martin type Sliding Caliper can be supplied alone or as part of a package in the Large Instrument Kit or Small Instrument Kit.
Specifications
Measuring range - inches: 0 in - 07.87 in
Measuring range - millimeters: 0 mm to 200 mm
Weight: 4.23 oz / 0.12 kg
The sliding caliper consists of a steel ruler graduated in millimeters (and on the back side is the graduation in inches), whereby the graduations can be 20 cm wide while the end of the main bar is graduated in the opposite direction from 0 to 50 mm. A circa 12-cm long transverse bar is fixed at right angles at the end of the main bar. A second transverse bar can be pushed inside its guide channel along the main bar. One end of the transverse bar tapers to a point, whereas the other end is blunt and flattened. The blunt ends are used for the measurement of living subjects, whilst the pointed ends are better for skeletal material.
The scale runs to 50 mm at the end of the sliding caliper, and it can be used by completely removing the guide channel from the main bar and refitting it upside down. In this position the sliding caliper can be used for measuring depressions etc.
The sliding caliper is also contained in the complete small instrument bag (No. 412) as well as in the large instrument bag (No. 413).
Application: When measuring you take the ruler of the Sliding caliper in your right hand by placing your thumb and possibly also your index finger on the slider. This is then moved by a slight movement of the thumb. To keep the instrument as steady as possible during the measurement, place the fixed cross arm on one finger of the other hand. If some masses (for example nose-width or ear-length) are taken off, it is advisable to support yourself with your left hand on the cheek, or on the forehead of the test person, so that the sliding circle a has better hold. To reduce the risk of injury, it is advisable to hold the instrument so that the transverse arms are not at right angles, but approximately tangential to the body surface of the subject.
At the free end of the ruler can be found, in reverse order, a division of 0-50 mm. This is used to measure depth masses such as the nose depth. To do this, you must first pull out the slide completely and put it back in the opposite direction.
Caution: For cleaning please do not use acetone or acetone-containing cleaning agents.
GPM anthropological instruments are high-precision instruments, manufactured for decades to the highest levels of Swiss quality craftsmanship. These instruments are exported worldwide and are based on the anthropology developed by Rudolf Martin. Ongoing work on new technology and development ensures an assortment of GPM instruments that are always up-to-date and meet every demand.