Lister 5/1 Diesel

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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