A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 386
y what device has its action been varied ? With what, as the least velocity, must this apparatus revolve, in orderto exhibit its true character ? What other toy has been founded on the durability of impressions ? What is the arrangement by which figures are viewed in the phantas-mascope ? How did… … 155. In the phantasmascope the pasteboard disks are paintedwith a variety of figures, in different positions, and the bordersof the disks being- cut into cogs or teeth, leaving openings betweenthem, when made to revolve on a spindle, on looking at the ob-jects as exhibited in a mirror, through the…
Physics
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