Engine Indicator Instruments 4
Dobbie McInnes Mathot type & Barograph
Photograph of a Dobbie McInnes modified Mathot type Indicator. Type 1. This unit has two drums,
one keeping a record of the sequence of firing pulses, the other of the cylinder pressure.
The basic mechanism is the same as the usual type.
Photograph of a Dobbie McInnes modified Mathot type Indicator. Type 2. This unit has two drums,
one keeping a record of the sequence of firing pulses, the other of the cylinder pressure.
The basic mechanism is the same as the usual type.
Dobbie McInnes Barograph. The motorised drum holds a long chart.
Pressure springs and engine cylinder tap are common to the other indicators.
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