GR translation: Teddy Bloat is mincing bananas with a great isosceles knife

[Mike Jing]

V9.15-27, P9.29-10.1   In the kitchen, black-market marshmallows slide
languid into syrup atop Pirate’s double boiler, and soon begin thickly to
bubble. Coffee brews. On a wooden pub sign daringly taken, one daylight
raid, by a drunken Bartley Gobbitch, across which still survives in
intaglio the legend SNIPE AND SHAFT, Teddy Bloat is mincing bananas with a
great isosceles knife, from beneath whose nervous blade Pirate with one
hand shovels the blonde mash into waffle batter resilient with fresh hens’
eggs, for which Osbie Feel has exchanged an equal number of golf balls,
these being even rarer this winter than real eggs, other hand blending the
fruit in, not overvigorously, with a wire whisk, whilst surly Osbie
himself, sucking frequently at a half-pint milk bottle filled with Vat 69
and water, tends to the bananas in the skillet and broiler.

What is an "isosceles knife" exactly?
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