Double drawing engine for weights, [423].

Double water-screw, [451]; cross-bow, [528].

Drebell, Cornelius, noticed, [402], [403].

E.

Ebbing and flowing river, [419]; castle-clock, [420], [421]; applied to two globes, [456]–[462].

Engine, portable in one’s pocket, [400]; ship destroying, [401]; to drive and fasten to ships, [401]; for cannon, [468]; a semi-omnipotent, [529]–[531].

Engine, a stamping, [520]; a gravel, [525]; a ship-raising, [526]; a pocket, to open doors, [527].

Engines of War, [468], [469].

Escutcheon for locks, [500].

Etten, Van, describes a fountain, [481]; recommends heat, [481]; cannon, [481], [482].