indicator; steam engine
Maker
Casartelli & Potters
Description
Steam engine indicator in a wooden box.
Part 1) Box has two hinges and button open. Brass carrying handle on side. Three labels in box, one on base (handwritten) and two on top. Internal forms for various part covered with green felt.
Part 2) Indicator - brass cylinder with attachments.
Part 3) Brass tap with simple open and close valve - on contents list
Part 4) Two rulers
Part 5) springs -steel with brass heads
Part 6) tap possibly- steel
Part 7) pins - steel (not clear if part of original item)
See A73.10
It was used to record "indicated horse power" The unit has a pressure connection direct to one cylinder of the engine. The cylindrical drum carries a paper sleeve and is connected by a cord to a reciprocating element on the same cylinder. The drum is controlled by a return spring and oscillates in synchronicity with the engine as the pen arm rises and falls in relationship with the cylinder pressure . The pen traces a PV diagram on the paper. Pressure on the y axis: volume or displacement on the X axis. The area under the graph indicates the work or power done by the cylinder.
The engineers rode in an indicator shelter constructed round the smoke box and front running plate in order to take indicator diagrams.
See e-files.
See full details
Object detail
Two printed labels - one instructions on how to use. See photo.
Engraved on side of indicator part 2:"CASARTELLI/ & POTTERS/ PATENT/ MANCHESTER/ 2404" "13" Inside is stamped "OIL"
Printed labels on box.
Part 4) First ruler "CASARTELLI MANCHESTER / No.2 / 12 TO INCH" second ruler "ELLIOTT BROs LONDON / No..5 / 24 TO THE INCH"
Part 5) 15 springs with various sizes (1-15) - "1/8" "1/8" "1/12 " 1/16" "1/24" "1/32" "1/40 WP 120 212" "8" "16" "24" "30" "1/50 212 WP 150" "60" "1/32 100" "1/40 212 120WP"
Part 6a) "10 3/4" Part 6a) "10 3/4 CASARTELLI & SON MANCHESTER"
Dimensions:1 - box:L 25cm (L 9 13/16")
Dimensions:1 - box:H 11cm (H 4 5/16")
Dimensions:2 - indicator:L 21cm (L 8 1/4")
Dimensions:2 - indicator:W 24cm (W 9 7/16")
Dimensions:3 - tap:L 10cm (L 3 15/16")
Dimensions:3 - tap:W 7cm (W 2 3/4")
Dimensions:4 - ruler (2):L 11.5cm (L 4 1/2")
Dimensions:4 - ruler (2):W 2.5cm (W 1")
Dimensions:5 - springs (15):L 5cm (L 1 15/16")
Dimensions:5 - springs (15):L 6cm (L 2 3/8")
Dimensions:6 - tap ? (2):L 12cm (L 4 3/4")
Dimensions:6 - tap ? (2):L 7cm (L 2 3/4")
Dimensions:7 - pins (2):L 6.5cm (L 2 9/16")
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